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  1. I recently had a 1962 vintage Longines cal 280 men's mechanical watch serviced. The mainspring was "tired" and the watchmaker ordered a replacement from his supplier. Upon receiving it, he noticed the end did not match the one he removed. He nonetheless installed it and advised me that the watch would require winding more often due to the spring slipping if it was tightened too much. The watch runs fine other than the more frequent winding required. I would like to locate an original mainspring if possible. I found on the ranfft website that the cal 280 movement has a mainspring with the dims 1.10 x 12 x 0.13. I assume 1.10 is the spring height and 0.13 the spring thickness, but am not sure if 12 is the spring length in inches or the barrel diameter in mm (the spring does appear to be about 12 inches long, though). On another website I found a diagram showing various spring ends, with one of the figures showing a "Longines T end." It was the only figure that had the word Longines associated with it. My question is: how would one go about locating the correct replacement mainspring for the Longines cal 280 movement? See attached photos which suggests the spring removed does not have a T end, but a thickened bridle (I think that is the correct term, anyway). Thanks from a watch amateur.
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