It occurred to me that these should be toward the front end of things.

Page 64 of the 1939 Stoeger catalog and detail images thereof.

Behold, the entry explaining 'foreign' proofs to we bloody Yanks, a 'snapshot' of European proofs of the pre World War Two era.

Vienna proofs, first proof and Nitro (Smokeless) proof, as commonly found on 'pre war' MS rifles and carbines