[jcassity]

a close up on each name plate reveals a numerical construction that to the eye seems to be an obvious date.
it reads........
12 - 14 - 21

it is found just up and slightly offset to the left of the area allocated for the serial number.
basically this date is found right above the number "2" in the serial number.

both nameplates have this same date. on the other nameplate the factory rivet is passing through the month numerical value.