Very nice. I guess this will get the Movado-Zenith discussion going!
Perhaps your GF bracelet looks like these two under the clasp:
Reference 138 705 501?
Mine are from the first quarter of 1969:
...but they don't belong to Tempo-Matics (though that reference number is the reference number of
your watch, I think). Mine came, from different sellers, attached to these:
Movado Chronodivers... a "tropical" cocoa-colored Datachron on the left, and a (probably oxidized) black-dialed Datron on the right (as far as I can tell, both of these dials would have been cornflower blue originally). The
Datachron was the first expression of the El Primero movement (3019 PHC) from Movado, called the HS 360. This ad appeared in the
New Yorker in November 1969:
The 17J Movado version of the El Primero:
Reference 434 705 501 on the left (chocolate-dialed Datachron). 434 705 50 on the right (black-dialed Datron; maybe a stamping error leaving out that last 1, maybe not?).
"Super Sub Sea", rated to 10 ATM... you might want to lay off the chrono pushers underwater, though.
Obligatory wristy:
The striking similarity of the Datachron Chronodiver to your (presumably earlier) Tempo-Matic, right down to the use of GF bracelets with Tempo-Matic reference numbers and that same bakelite bezel, leads me to believe that the Datachron Chronodiver was among the earliest of the 3019 PHC's. It's almost as if Movado said "Oh, we're going to get some of the world's first high-beat automatic calendar chronograph movements... sure, we've got cases to put them in... just let us modify this Tempo-Matic ever so slightly and voilà."
Datachron was shortened pretty quickly to
Datron... I'm not sure when exactly, but I would be surprised if the change occurred after 1970 or '71 at the latest. Here are some brochure shots of Datrons and Astronics from 1974:
Someday I gotta fill in that gap in the middle...