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The 75 on the right is called 'forced matching' - and the grips are usually what I think of for a 'Russian Capture'. They were usually 'dip blued' and sometimes this bluing can be taken off. But if overall it looks nice, I would leave it, as its import marked and with the sideplate renumbering.
The trigger, take down etc should be strawed on a 1936
Ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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