Sapper..... I agree about it being the correct sideplate.
I took another look at your great pictues and believe I see an Eagle over 6 stamp on your hold open. IMO this is a replacement part originally made by Simson and again could have been a replacement during the war. Simson stamped parts show up on 1939 Mauser Banner guns and many believe that left over parts from Simson went to Mauser.
The original hold open would have had the last 2 digits stamped like the rest of the parts.
If it were mine, I would leave it just like it is.....
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dave
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