Master Water Conditioning? From Pottstown PA? They have been in business for decades selling to many plumbing and well drilling supply houses, plumbers and drillers in PA and surrounding states. Possibly to some dealers too but I never heard of any.
I don't see any Clack valves and what I do see is Autotrol and I think Fleck but they look proprietary to me because the covers don't look like stock covers and, reading about the one that looks like a Fleck, the description sounds proprietary.