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British pheon (broad arrow) surmounting the letter I, possibly indicating an Indian service watch.
Or possibly not, it may remain one of life's smaller mysteries.
The engraving on the caseback is similar to artillery symbols I've seen.
You may want to bring this to MWR's forum for help.
I don't believe it's Omega/Patria/Tissot etc.
Can we see the inner caseback?
I'm guessing American(nickel cased? A-R+ F-S), calling @OMTOM , @Tire-comedon, @JimInOz
Wish I knew how to google that engraving on the back......unit symbol, I bet.
Looks an awful lot like this movement sold by Dimier Bros, which David Boettcher speculates was made by Fontainemelon or Schild: https://www.vintagewatchstraps.com/movements.php#dfc
His whole site is worth a browse for a look at many movements from this era. Nice piece!
👍
No longer a small mystery.
However, the toe at the foot of the barrel bridge is proving a problem.
I can find may calibers from different ebauche makers of similar design, but so far none with the tell-tale toe.
Any movement maker with that picture?
Cheers Russell.