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Very pretty. The movement is very reminiscent of the 1940s Omega bumpers.
 
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As I understand it, Tissot may have borrowed the design from the folks over at Omega.
Were they I wonder already both under the SSIH umbrella perhaps? Not sure. My point was that maybe an Omega bumper spring might work!
 
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Were they I wonder already both under the SSIH umbrella perhaps? Not sure. My point was that maybe an Omega bumper spring might work!
Yes, I think since the 1920s at least.
 
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My 6546-1 says hello



Cal. Tissot 28.5-21.
Tissot produced many calibers for Omega prior to the merger.
This caliber was supplied by Tissot to Omega.




According to theses indications, I can tell you that the Tissot watch with movement number 1838649 and reference number 6546-1 was produced on February 17th 1948 and has a calibre number 28.5-21.
 
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I had no idea Tissot used bumper automatic like that, it really is almost identical to the Omegas of the time which makes sense, probably very robust as well
 
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Tissot even made beefy lugs, clover crown seamaster look-alikes... Another 28.5:

(bad phone Pic, I don't have my nikon at hand)
 
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My watchmaker was able to bring this mess of a movement back to life so yours is definitely salvageable.