The circle with a cross in it is a British proof, although it is unusual to see it in a circle. The gun has been "commercialized" which may account for the date being ground off. The eagle is an independent firing/rework proof used by gunsmiths to conform to the 1940 German proof law. There should be a letter under the eagle but it may be obscured by the original Erfurt firing proof. If it is a "N" it is a nitro firing proof, if another letter it is a rework mark.
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If it's made after 1918...it's a reproduction
Last edited by Ron Wood; 02-19-2015 at 10:14 PM.
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