Posts 30,094 Likes 77,676 Archer ·Feb 26, 2020 Just FYI - to broaden your search, the balance used in the 503 is also used in the 490, 491, 500, 501, 502, 504, and 505.
Posts 5,613 Likes 6,385 CanberraOmega ·Feb 26, 2020 Archer Just FYI - to broaden your search, the balance used in the 503 is also used in the 490, 491, 500, 501, 502, 504, and 505. Thanks
Posts 18,589 Likes 38,581 JimInOz ·Feb 26, 2020·Melbourne Australia Part numbers from original parts list, later ones may be longer. (ignore 1324, 1326 should get you out of trouble) Or if your watchmaker just wants a balance staff.