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Old November 25, 2004, 08:26 AM   #4
Staff Alumnus
Join Date: October 12, 1998
Location: Missouri
Posts: 1,992
As per an older edition of The Standard Directory of Proof Marks the eagle over N is the standard proof mark (after June 1971, a stylized eagle is used instead of a more stick-like drawing).
If the antler is the left half of a set of antlers then that is the mark of the Ulm proof house, where the gun was proofed. The letters (or numbers) next to it are a date code, though there should be three letters (or numbers). The letter (number) is the month and the last two are the year. Thus, for example 668 would be June 1968. Using the letters "A" to "K" would sometimes be substituted for 0 to 9.
I can't find anything on NDS inside a square.
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