outdoorlyr: What I told you was correct but incomplete.If you have Gun Digests from 22nd Edition through the 33rd edition,you will have everything (I think and hope) that Lee Kennett wrote on proof marks. Where I went wrong was that I looked at the 25 year Treasury and neglected to check the actual issues of the Gun Digests and I don't have the 30th year Gun Digest Treasury.Or the Thirty-fifth.
Not to bore you too much the years cover:
22nd Edition Czecheslovakia
23rd Edition Austrai Hungary & Austria
24th Edition France
25th Edition Spain
26th Edition Italy
27th Edition Hungary
28th Edition Russia
29th Edition Germany
30th Edition Military
31st Edition England
32nd Edition Belgium
33rd Edition India.
Sorry to go on and on but this is the best way I know to give you an answer that will enable you to select the right edition if you have a particular need for one country.I might add that the issue on military proof covers only Britain ,the US,France Russia and Switzerland,so it may not interest you.
Apologies for not getting back to you more promptly.
Best Regards
Gene