Is it an early Zodiac 70 version?

[YuriyV]

Found this main plate in recently bought stock of old Zodiac parts.
It has completely the same layout as early Zodiac 70 or Zodiac 70-72 No Date.
But different design of hacking second mechanism. Never even heard about this before IRL.
Checked old Zodiac service notes. Found nothing about it.
As I said, it has the same layout as Zodiac 70 and compatible with all its bridges and dials.
Did you guys ever seen this?

[Ultra-Vintage]

A variation of the Olympos movement.  Many Olympos movements were non-hack, but some early ones had a hack mechanism like what you have pictured.  Later models, if hack, used the same mechanism as what is most found in Zodiacs.  The Olympos used the chopped off bridge for the intermediate setting as well, and was usually a push-button detent (which it looks like yours is, but hard to see from pic).  I had the same identical movement in an Olympos Mystery within the past couple of years, but sold it when I found one with a more rare trim color.

[YuriyV]

Interesting. Thanks.

[Butch]

You're good.

[Ultra-Vintage]

You're good.

As long as I have one person convinced