"Bob" signed his upgrades in at least two different locations; the more common one was on the bull nose end of the trigger plate, and in either the left or right side of a border of the trigger plate. The former, being curved, had less information, but the straight often included a date.
The DelGrego stamp that Reggie refers to, was something they used randomly. It doesn't appear on many of the upgrades done by the two, together.
I wasn't aware of DelGrego stamping a date of their upgrades, until Brian found it while working on mine, in the top tang groove.
Reggie will probably agree, the timing of your post is ironic.
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