Dale, the numbers 8 3 on the lug are what is left of the last three numbers of the serial number of the gun. This gun was made in 1902. At that time all three numbers were present on the lug, but in 1910 Parker Bros went to a different locking plate on the lug that had a vertical leg coming down with a pin through the side of the lug to hold it. At some point in time this gun was returned to the factory for some reason and Parker installed the 1910 style lock plate on the lug. When the lug was machined to except it the middle number was lost, leaving only the 8 and 3 visible.
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