The 7924 is not a reference we see every day, here or there. For a good reason: The production numbers are quite low. It is said that only 200 were made at the end of 1958, I would say much more, but still, not that many, compared to the 7928 / 7016 / 94010 and 94110.
Let's see those I could find on the net or in the real life.
7924 100 meters dial, 275 6xx:
275 667: Antiquorum:
275 674:
275 679:
275 705:
275 xxx By Matteo:
292 xxx:
292 xxx by Jatuka:
Another 292 xxx ( credit picture unknown ) :
293 111:
293 xxx Credit picture: Fourtane:
293 090 ( Auction house, but I don't remember which one )
293 xxx Credit picture: The Vintage Concept.
7924 ARA 61 186 by Submariner:
7924 ARA 61 191:
And 61 193: ( Antiquorum ) :
These 2 " ARA " are coming with a 293 xxx Serial Number.
As for the case backs, what I could notice is:
A sterile case back in the 275 XXX series:
Engraved in the 292 xxx and...
293 xxx series:
Same big " Brevet " crown and movement ( Cal 390 ).
Please feel free to add yours!
Best,
Nicolas