Finding Date of Manufacture (D.O.M)

hi All, How do I find the D.O.M. of my 71 Challenger if the black information decal is missing ?(from the drivers door). My 73 Rallye has it but my 71 doesn't, I presume it was missing before I bought this car. Does the VIN tag on the crash pad near the windscreen have a code for the D.O.M.? I have the options tag from the engine bay but I can't see any date there.

I put this OP thread here in Body Shop, as that's where the numbers are.

Thanks
Author: 70Hardtop