151 of 152 people found the following review helpful
Still an excellent purchase for its price,
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This review is from: Olive Drab GI Vietnam Era Type Military Wind-Up Wrist Watch (Misc.)
This is a hand-wind watch. It is rare to find a wrist watch with this mechanism that is not an antique. The nylon band absorbed a lot of water during a morning run. Othewise, it is a good fit. The arms, especially the second hand is easily visable for those of use with failing eyesight.
Based on a limited measurement, 3 points, the watch is running fast by an average of 39 seconds per week (2 min. 36 seconds per month). The students t for a 95% confidence interval is 68 seconds maximum and 10 seconds minimum. All of these values are positive. The watch runs fast. This is an error which is probably unusual for those familar with quartz technology (+/- 2-4 seconds per month)
All in all, this is an excellent watch for working outside, hunting, even running.
The next tests will be time to unwind. It is performed by winding the watch, carefully, to maximum and then allowing it to wind down. With one sample point: 51 hours to unwind from maximum at 74 F.
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For accurate time-keeping, wind the watch in the morning and at night. Otherwise, it will lose time if wound once a day.
After 18 months of use the nylon band is wearing at the edges. Otherwise, as time piece the watch works well.
After about 30 months of severe use, the first watch is done. Stick a fork in it!
Winding the watch has always been a little tricky. The main shaft grinds a lot, especially if you turn it full stroke. It works best if you gently roll it, moving it less than an 1/8th of an inch with every turn.
I wore it as my work watch every day for 3 months in the tropics. Tough watch. It was constantly wet from sweat or rain. The crown is not very resistant to scratches so it was in pretty bad shape after a few weeks. The accuracy severely declined during this duty. The watch band is noticably lighter than the new watch I purchased as a comparison. The accuracy is now so bad that after wearing it everyday for running and biking then everyday for a plant commissioning job, it sits on the shelf waiting for a last trip the the trash bin.
All in all, not a bad watch. As with most things, a bit disappointing in the end.
Tracked by 1 customer
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Showing 1-10 of 11 posts in this discussion
Initial post: Nov 19, 2008 6:48:00 AM PST
Adolfo Camara says:
I was not expecting a so complete review of a watch, with tests and everything, but thanks, I think I will buy one.
T students. The name makes me shudder since I took Statistics a long time ago.
Posted on Nov 24, 2008 6:08:47 AM PST
M. OLSON says:
Excellent review. thanks.
Posted on Jul 15, 2010 12:27:02 AM PDT
Dr. No says:
Very practical and thoughtful review. Thanks for posting.
Posted on Oct 6, 2010 7:03:11 PM PDT
multi-topic reader says:
made me grin at the thoroughness of your review but the details are great!! was looking for something to wear in a fairly tropic environment and if I could get a year out of it, that would be great.Thanks for review
Posted on Nov 14, 2010 12:04:01 AM PST
Daniel Martinez says:
Very detailed and structured review. Thank you. I have one question: can you read the time in the dark? If so, how well?
Also, being hand wound, does it tick [loudly]?
In reply to an earlier post on Dec 25, 2010 11:17:40 AM PST
Rudolf Dankwort says:
It should be "Student-T" anyway.
Posted on Feb 27, 2011 3:35:25 PM PST
Tomasina M. Covell says:
Does it have any way of opening the back so the movement can be inspected and oiled etc?
They don't show us any pictures of the back, and the description is pretty sketchy anyway.
In reply to an earlier post on Feb 27, 2011 5:37:52 PM PST
Rudolf Dankwort says:
My impression is this is a Chinese cheapie and probably better avoided unless you're impecunious. If you want a really good windup watch, Victorinox makes them, but they're very pricy. Too pricy for me. I gave up on battery-powered watches and am using my grandfather's windup Alpina pocket watch. Beautiful piece!
Posted on Feb 27, 2011 9:42:19 PM PST
J. Thompson says:
Very helpful in depth review of the watch, especially how it runs fast, but should be wound morning and night. Thanks. Jim
In reply to an earlier post on Oct 18, 2011 8:28:26 PM PDT
Last edited by the author on Oct 18, 2011 8:29:28 PM PDT
Dirk: you performed a t-test based on 3 samples?
Rudolf: typically we use 't' for Student's statistic, and 'T^2' for Hotelling's.