Side Lock Plates
The 3 pin lock used on grade G and below has some axis wiggle. The 4 pin used on D and above does not.
Many guns with s/n less than 4000 - 5000? carry 1878 patents on the inside of the lock, although the gun was made at an earlier date. Some of these also have fore end latches.
These guns may have been display/salesman's samples that were updated before being sold to a customer.
Best, Austin
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