There could be a serial number stamped on the inletting around the trigger area, but were Venom only doing this for a certain period of time ?
The stock I had was a Venom 77 Vantage purchased new 1992 I don't have that stock anymore but I still remember it's serial number.
Given that this stock was very near the 1000th stock Venom had made, would their serial number stamp have been for all their stocks sold, or just for the 77 Vantage stock design ?