Anyone ID this Centre

I opened this thread this morning and was genuinely curious, so I spent a good 30 mins browsing google images of all the different obscure makes that use a drop-out third member live axle. Thought for sure it would be a Datsun or Mazda, no luck. Definitely not Toyota. None of the old British cars match. It's not the old '57-'64s GM center. Decided i'd spent enough time on someone else's problem and moved on.

Still curious what it is but done looking.