Airain Type 20 / XX vintage flyback

Not to hijack the thread, but IIRC, the three stars on the back indicate issue to helicopter pilots.

and for @Dan S
Type 20 by definition is a military designation, type XX is civilian version.

this caseback doesn’t have any “FG – Fin de Garantie” inscription, as you will often find on French military casebacks, and especially on Dodane and Breguet Type 20/21. This inscription was stamped on the watch back by the military watchmakers at the end of the servicing in order to indicate the next servicing date. The ALAT‘s ( helicopter army squadrons ) chronographs never had an end-of-warranty inscription and were maybe serviced by civilian contracters, but no proof for that yet.

The 3-star marking on the outside caseback means that this chronograph has received one of the highest distinctions from CETEHOR (CEntre TEchnique de l’industrie HORlogère), created in 1945, in order to promote the quality of the French watchmaking. The CETEHOR had an official control department, equipped to subject the watches to series of very demanding tests concerning the quality of manufacture and the precision of the movements. A few companies have had the privilege to win the 3 stars distinction for their watch. Yema is one of it. Dodane is another.
If interested, I invite you to read the very complete © article by ChP on the French forum Montres pour tous, with a lot of historical documents.

This above watch seems to have correct number and 3 star inscription, although polished. GLWS !

The movt pics don't seem to be showing up though - might need to repost them?

That is looking crisp and clean.

Nope!
It is a french quality mark from the CETEHOR (centre technique de l'industrie horlogère) in Besançon, it has nothing to do with it being officially issued or not. 1, 2 or 3 stars depending on the complexity/quality. Usually issued watches for the french airforce have warranty service marks stamped on the outside of the back (FG + some number). I suppose more than a few of those were privately bought and flown in service by military pilots though.

EDIT : for reference

https://www.montrespourtous.eu/viewtopic.php?t=2564

Thank you for confirming my earlier post 👍