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628 of 648 people found the following review helpful
Verified Purchase
I am still in the process of reviewing this product. Here's what I have so far:

Xbar 107 seconds/week (runs fast) (7 min./month compared to 2-4 sec./month quart watch)
St DEV 27 sec.
N = 7
95% CI 2.447 using Student's t
m+ = 136 seconds/week
m- = 78 seconds/week

Summary:

Good points:
* Beautiful with dark blue face, white symbols, functional medium blue nylon band;
* Easy to read, even in the dark;
* Easy to use with uncomplicated settings similar to other watches;
* Compact design;
* Measurement consistency is excellent compared to quartz mechanism.

Bad points:
* Difficult to set time (see instruction below);
* Gains 10 seconds a day (consistency); and
* Does not have a manual wind stem.

Discussion
This watch looks great. Unlike other self-winding or kinetic watches, this one is compact. In the best tradition of Japanese product development they thought hard on how this watch should function and say about the wearer. The hands are easy to reading, even for those of use with failing eyesight. The second sweep hand has a read tip allowing easy setting of the time.

Unlike some Japanese product, they provided a short, simple instruction on winding the watch. Here, I am comparing them to Citizen's ecco-drive watch, which I also own. Just gently work your arm back and forth for three minutes and the self-wind watch will charge; or, you could wear it for a day.

Okay, now for the negatives. First, this is not your quartz watch. The original self-winding mechanism was invented, according to Wikipedia, by a Swiss watchmaker in 1770. Since then it has gone through several improvements but is not as accurate as the quartz mechanism popularized starting in the 1970's. Sieko warns that this watch could be off by as much as 10 seconds a day. One days use indicates that my watch runs about 10 seconds fast.

The great watchmaker Harrison, who invented the first chronometer accurate enough to track longitude, said that consistency is more important than accuracy. (A poor copy of one of Harrison's chronometers was carried by Captain Cook on his circumnavigation of the globe. He had nothing but good things to say about it.) I have another self-winding watch, an Armitron, which runs consistently 15 seconds fast on days that I wear it.

From my measurements of quartz watches, their accuracy, while dazzling when compared to old hand-wound watches, are less accurate than my old German pendulum clock. So I am told, the longer the arm, the more stable the swing and the more accurate the timepiece. I compare everything to atomic time. And, because the quartz mechanism is battery-driven, it seems to suffer from inconsistency. I carefully measured my collection of six quartz watches over a 2 year period. While the battery was new, the error was consistent. As the battery burned out, the error became difficult to predict. Sometimes a positive error (adding time) would become a negative error (losing time) as the battery died. This dying period was also hard to predict.

The accuracy of the quartz mechanism is not as good as my pendulum clock. They all lost or gained approximately 2-3 seconds, on average, per month.

Based on a week of measurements with the Armitron, I would say that it is shockingly inaccurate but consistently so. Assuming that the Sieko error continues to be consistently 10 seconds fast this will mean that I will have to reset it every week. This is a small price to pay for an otherwise beautifully crafted and honestly-priced handiwork.

Setting time
The date and day are fairly easy. I suggest turning the watch arms until the click past a day so you won't be twelve hours off.

Setting the time is another matter. What works best is to set the hour and minute hands, then gently hold the second hand. It should pulse a little as it tries to force itself forward. Once the seconds are accurate, release and the second hand should be accurate. It takes a little practice at first and don't set the time until you pump the watch 3 minutes to charge the spring.

Time to unwind
It takes about 39 hours (1 test) to unwind.

[...]
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80 of 86 people found the following review helpful
on June 28, 2011
I've owned a Baume & Mercier automatic and a Longines automatic watch for years. Since the other two watches set my wallet back quite a bit, and also since I've "acquired" a wife and two little ones since their purchase, I didn't want to break the bank this time around. So, after reading reviews for this little gem, I pulled the trigger and scored one for twenty-five bucks less off of eBay. This watch is simply beautiful! I've owned it for three weeks and it still has maintained the same time as displayed on my cell phone. Hasn't lost a minute. It's performance is on par with my other two automatics, but I spent literally thousands of dollars less on this purchase. I was in the market for blue-faced watch that I could wear with a pair of british tan shoes and belt, so I took the liberty of replacing the blue nylon band on this watch with a cognac-colored Rios leather band I also purchased off of eBay. I also replaced the buckle with a Hadley-Roma deployment buckle with brushed stainless steel finish, which matches the brushed metal of the watch perfectly. Check out the 3 pictures I've uploaded. Nice right? I actually ended up paying more than the watch itself for the leather band and deployment buckle, but hey, considering how much I saved on the watch, it was well worth it. I plan to have this bad boy for a long time. Thank you Seiko for making affordable, sporty automatics at a super affordable price.
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37 of 39 people found the following review helpful
on April 10, 2010
This review was originally written for the SNK803K2. The only difference is the color of the dial. But I bought this on too.

For me this watch is fantastic. If you know auto-winds (automatics), then you know their little idiosyncrasies. So let's start there...

Timing:
It's not a chronometer, it does gain (or lose) more than 0.5 seconds/day. In fact, on some days it seems to gain as much as a minute. Gaining time seems to be a common observation with other owners and reviewers. My guess is that it is "set fast" at the factory, with the idea that "if we can't get it perfect out of the box, then it's better to be early than be late." For this, you could probably go down to your local watch repair and get the timing set. Having said that, My watch normally runs about a minute fast over the course of a month and that doesn't bother me. In fact, true to all automatics, it gains and loses a little time each day or so and it is generally the same "one minute" ahead of the current time for several months.

Quality:
The watch is obvious quality. Seiko is quality and they obviously get a great job on this one too. It's quite rugged. I regularly ride a both a mountain bike and road bike to work, which is 12 miles in one direction. The watch take a vibrational beating, but never really misses a beat (outside of the range mentioned in the previous paragraph).

Looks:
I wasn't keen on the style of the band that came with the watch, although it is tough and will probably never come apart. I went a got a leather band, and this thing is beautiful. No kidding, totally styling.

Trivia:
The numbers on the watch dial are definitely unique: minutes on the outside; hours on the inside... Okay - but is a great way to help little kids to tell analog time, "The little hand tells you the hours and the big hand tells you the minutes." Was it planned?

Recommendations:
I went out and got two more. Another for myself, with a green dial (that my oldest son commandeered) and another with a blue dial for my daughter in the Coast Guard. I was able to spend $64 a piece for these, so really, I think they were a great deal.

I have an older, beautiful Omega Deville that I wear when the occasion arises, but to tell you the truth, I end up feeling just a little guilty leaving this watch behind for some event, when it really is my trusted time piece.

However, after this... An Omega Planet Ocean.
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68 of 78 people found the following review helpful
on June 29, 2007
This watch comes in 4 models, SNK 803 with a beige strap and dial, SNK 805 with a green strap and dial, SNK 807 with a blue strap and dial, and SNK 809 with a black strap and dial. What I like most is the red tip on the seconds hand that sweeps continuously across the dial and not in steps for every second like in most analog watches. Also cool is the untraditional numbering of the hour markings, where the 5-minutes are more protruding than the hours. The strap looks better in the photos than in reality, but it's still very nice and tough-looking, although it is narrower than you think when you see it on the guy's arm in the pictures above. The see-through case is a gimmick I could do without, but anyway, nice to watch the watch work. Buy all four and you have one to go with every occasion and dress colour/code. This item sells on eBay for 30-40 dollars.
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47 of 53 people found the following review helpful
on September 23, 2009
Verified Purchase
This is a very special watch in several respects: You can see the clockwork through the transparent backside; both day and date are shown; there is no need for battery changes, nor manual winding up of the clockwork. The strap is solid and washable. I have become very attached to it ...
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22 of 23 people found the following review helpful
on May 8, 2009
Verified Purchase
I have had numerous watches over time, almost one per year, this will be the last watch I purchase. Since I wear it 24/7 it keeps pretty accurate time. Stays glowing at night for long periods of time and is easy to read. The watch band is very strong, comfortable and easy to wash, should last a lifetime.
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14 of 15 people found the following review helpful
on March 1, 2011
Verified Purchase
I have had this watch for a week now. It is extremely resistant to scratches, both on the crystal and the stainless steel case. I like that the watch is very lightweight, easy to read, and the 6-ticks-a-second second hand is fun to watch. It glows very brightly at night with even a minimal charge. It runs about 10 seconds a day so far. The display back is very cool too.

Great buy for under $100 on a high-quality watch!

Update: After another week of fussing with the adjustment, the watch now only runs 2 seconds a day. That's right up there with quartz! Just to pass this along, to stop the second hand, turn the setting knob back slowly. Once you get the feel for it, you can stop the second hand just as if it were a "hacking" movement, which lets you set the watch precisely. If you're careful, you can set the minute hand so that it points DIRECTLY to the minute mark just as the second hand passes zero. But maybe I'm too fussy...
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9 of 9 people found the following review helpful
on September 10, 2013
Verified Purchase
The best that I can say for this watch is that "It's okay." Although the case diameter is 37mm, the watch face is 27-28mm - a little smaller than anticipated. That said, the watch dial is easily readable at a glance, the contrast of the hands and background markings with the face is quite good and the day/date windows are reasonably visible. The "lume" is also quite good. The nylon band "is okay" and is holding it's own doing yard work, outdoor activities, etc. The automatic movement "is okay." Time keeping has been acceptable. The power reserve is disappointing, however. I've had this watch for about one month now. After a deliberate "swirl" of the rotor for 2-3 minutes in the morning and a full day of wearing, I have had to reset the time/date/day each subsequent morning. Other reviewers seem to experience better with their reserve. "It's OK" for the rough and tumble use that it gets and for it's price point.
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9 of 9 people found the following review helpful
on August 5, 2010
Verified Purchase
I've had this watch now for about 4 months. It is surprisingly accurate given some of the feedback here....maybe gains a minute or two a week! Very high quality, sits nicely on the wrist, extremely durable (I've spent many a day in the ocean, at the beach, bike riding, tennis...you name it with this watch) and is attractive and simple. A real everyday watch at a nice price - and being an automatic I never need to worry about winding or batteries. I have more expensive watches but this one gets the most wrist time. Thumbs up!
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15 of 17 people found the following review helpful
on May 31, 2009
Verified Purchase
I hardly ever wear my other watch any more. This watch looks great and I love the mechanical movement. It's less accurate than a quartz watch, but after weeks of wearing it it was only off by a minute. The watch glows in the dark for a surprisingly long time even after being exposed to light for only a few minutes, and you get the day and date as well as the time. I would not hesitate to recommend this watch to anybody.
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