As close as we can pin it down is 1975. Camco not only began threading all the lug screw holes in the shells, but they also changed the interior hardware (Lug screws etc) to aircraft grade aluminum. It's an easy way to date your kit to pre 1975 or 75-77 time frame. I am sure Antipodes, Dolfan, Fishwaltz, and VintageDrumBug have seen as many if not more than I have since most of us are here in the state of Ca. (Bay Area & LA) which seems to have the lions share of L.A. era Camco drums. Everyone has their favorite era, and for me it's the L.A. era drums. Similar to DW's Collector Series Maple but with custom bearing edges, machined hardware, and that aged Keller maple...Like DWs on steroids..Lol...
Thanks Roger, you’re a wealth of information.
With this set something fishy is going on.
The bass drum and the 15” have the alu screw like on my AC Blue set. The 12” and 16” however have the flat-head screws like on my clear maple Oaklawns.