Well, got this one in the mail today. 'fraid it's a bit of a FrankenCyma, as I think the face was indeed redone (was hard to tell from the seller's picture. I can live with it...), but that's not so much my concern as I want to identify the calibre inside.
Over at Ranfft he shows a number of Cyma calibres that just don't match up. Look at the pictures: there is an escapement finger bridge with the rest being more or less a 2/3rds bridge. There's no shock absorber, incabloc or otherwise, so I doubt that it is of a more recent vintage (i.e. from the 1930s onwards...), and it looks to have the finish of the Cyma 01x family from the 1920s.
Which is indeed gold-plated, really nice, and most of the wheels show the same finish. It is a very strong ticker, performing very nicely, decently regulated (will find out the accuracy tomorrow evening after wearing it tomorrow!
But I see no indication of any model number, though.
Almost certain that it is a 7-jewel model, but does anyone have any idea of the calibre, etc?
PS: looks to be 10.5 lignes...and it does have the seconds subdial at the 6. And it does seem to be ticking at 18'000, which is pretty fast for a calibre from the 1920s...