I am no expert in Breitling, but made my first expensive failure with it.
Is it a South American seller maybe? The case doesnt look OK, I have never seen those lugs on a vintage Breitling, the movement doesnt belong also to that case, the dial is repainted. The way of signing the dial looks South American job. There are not a lot Breitlings bridge signed before WW II, so somebody signed just everywhere possible to have justification. If you didn't buy it yet,I would say stay away. if you bought it already, wait somebody else to come and comment also who has more vertical depth in Breitling.
As said no expert opinion but mentioning just what I saw and read since a while.
I agree with all said above. dial is clearly refinished, Breitling logo on dial and bridge wrong for the period (assume watch is early 1930s), bridges were unmarked until the early 1940s, dials unmarked or marked "Montbrillant". is there a serial number outside the caseback, is the watch 18k or GP ? franken at best, I'd say.
While the lack of an incabloc shock protection would suggest prior to 1938, I don't think that is a Venus 150. Maybe a clone? The column wheel on V150's should have 7 pillars, not 5. I have a Gallet powered by the 150, but can't find my photo. Here is one from Gallet themselves:
And most definitely a re-dial job. I would stay away from this one.
definitely not a Venus 150, no doubt, here's an mid 1940s Breitling V150.
there is a mid 1930s "Montbrillant Sprint" advertisement that shows a watch with similar lugs AND a "Breitling" brandee dial, never saw one in the metal or photographed. would want additional pics.
edit: the only similar movement I find on pics is defined as a Venus 165 - but it is the notoriously unreliable Breitling Museum of Michael Maerz who lists this, Ranfft has no mention of it.
Depending on size, I would still say that it is a (modified) Venus 150 (if 13''') or 175 (if 14'''). Remember that the movement has been modified to monopoussoir (single pusher) function so that the number of columns in the column wheel has had to be reduced.
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