The tone control looks to be nickel in your pics which is the typical tone control that I've seen. My guess it's original to the drum but there really is no WAY to know fore sure. It's also in the same panel as my two GW snares that have tone controls.

Eddie Knight was a Camco endorser and promoted Camco drums through his school. He would place that stamp on all the Camco drums that were sold through his school. I met Eddie two years ago and although he's in his 80's he still teaches 7 days a week!

Steve Maxwell had a 22/12/16 w/ snare in WMP but it sold a few months ago. So far that's been the only WMP kit I've seen for sale.

GW drum sets are very hard to find and don't come up for sale very often. I own 2 kits, one 22/12/16 w/snare in green sparkle and one 22/12/14 w/6.5x14 in gold sparkle. Neither one is for sale. I traded my first GW 22/12/16 in BDP for the gold sparkle kit!

Good luck on your search and I'll let you know if I run across a WMP kit.