Krause sets the standard for catalog publication so if you are even moderately into the 17th century coins (and your interest exceeds some small area) you simply must have this volume. There is no other way you can access such a wealth of knowledge. Having said that I have my reservations. Many of the historical notes are at best sketchy and have little (if any) connection with the period covered by this specific catalog. And some notes prove that Krause can get it right (Transylvania for example). The illustrations for Germany are more than impressive (although I am not happy with overlapping pictures...) but Italy for example doesn't deserve as much. This is not just a whim - at least a single picture per country would be good, it is often so that you have to recognize a coin by coat of arms when letters are worn out. No such chance with Albera, Arquata, Campi, Cisterna, Compiano etc etc. Monetary systems are given for only a few countries. For some countries you have the value of a coin given in several ways (Poland) and monetary system is described in minute detail with names of coins of specific denominations (Russia). However, for quite many you are left guessing e.g. how much if Fyrk (Sweden). Is it less or more then 1/6 ore which follows? The sequence in which coins are ordered seems to be quite haphazard. Editors of the Polish section mixed up "grosz" (1/30 of zloty) with "silver grosz" (1/4 of zloty) so that the sequence in the catalogue (values expressed in copper grosz) is as follows: 7 1/2, 15, 18, 3, 6, 30. Such minor flaws which can be quite irritating are quite a few. It seems that the editors were in a hurry to get the volume on the market before Christmas and neglected to do last check-up. Unfortunately, this seems to be quite a regular thing about Krause coin catalogs. In short if your interest in the 17th century is moderate - you have some coins issued in the period and you want to know if your investment brought profit over the years or you want to see what coins in the period looked like and who issued them as a part of your general interest in numismatics - this is your book. However, if you are seriously interested in any specific period or area, the value of this volume will be rather limited for you and it may not exceed current price estimates.