Hey folks- I'm the proud owner of a complete (hardware included!) ludwig Pro-Beat, that is from the mid-70s as far as I can tell.

I'm looking to get a bit better idea of the date they were manufactured, as I'm finding some conflicting info between the Serial # and the shell construction.

All the Serial #'s on the B/O badges are in the 1,350,000 range (leading me to believe its a post-'76), but the shells are (i believe) 3 ply, as they all have reinforcing rings and clear interiors, which were made pre-1976. It has 24" bass, 13" and 14" toms, and 16" and 18" floor toms in silver sparkle

Any help in nailing down a bit more of the age of this kit would be very appreciative!