Genuine Toyota Part # 8431021010 (84310-21010, 8431012081, 843102101086) - Switch assembly, turn signal. Electrical. Fits Land Cruiser. Ships from Stevinson Toyota West, Lakewood CO
parts.stevinsontoyotawest.com
Sounds like GregoryB might have you covered on a used one. If not, I have a used one, but I'm unsure of the working condition.
Here we go, this came out of a 9/73. It looks like one of the wires had something spliced but that should be an easy fix. I'm in Centennial and around most of this week. I can do $50.
Thanks for your reply, but I already lined up a switch from @scheefdog, as any used part is suspect until install, and that verifies working condition...I'll keep this info handy, and will contact you if the first one doesn't work out.