Movement is double date stamped with a cresent moon and a shield. Watch is as found. Bracelet if not original is most certainly of the period.
Very beautiful watch.
Dial looks like Ambassador C 1939
There's another 1939 Ambassador "C" in the database, along with the following 1939 ad in that record:

There's a couple of other '40 unknowns in the DB. As pointed out in one of the other records the crystal specs point to the Conqueror and Phantom. The '39 Phantom case looks like it could be the same but engraved. There are no ads from this era for the Conqueror.
In reply to There's a couple of other '40 by DarHin
There are now, Darren.
1939 ad, so does this mean the subject is a Phantom variant?
It looks like one.

Great looking watch but unknown for now.
The '37 Phantom had a 6 ligne movement by the way.
Unknown from me. Great watch. I'm being a littly lazy, as I haven't checked all the ads to see if I can find this one or very similar- just most of the ads :)
Unknown
"
(although I suspect the Watch will be an 'AMERICAN EAGLE' variant.)