No idea what brand this is please help!!!!
What I do know is that house was built in 1978 the fixture is original.
Also I have no idea if the remaining handle is original hardware, my dad who originally bought house was the umm how can I say this correctly, lol a shadetree rigging plumber. I do know he had worked on valves in the past and he is known for finding whatever he can that somewhat fits... so as stated earlier handle may not be correct lol
anyway here are some pics