It seems I found my own answer….. I pulled out my 1984 Hamilton literature for their replica “21” chronometer offering (I had remembered it as being sometime in the ‘70’s.).
This appears to be a dead match. The literature also described it as a lever escapement movement. (Another wrong memory,…. I had thought they were legitimate detent reproductions.)
The cost when new, ...... $1595.
Now I have the chronometer to go with the literature. Lol, ....... it's usually the other way around.
... And I already have a box w/ gimbal for it, and it can sit next to my real '21'.