OMEGA 500-1327, Balance, complete - NOS

OMEGA original balance, NOS from and old assortment. Omega part no: 500 - 1327 Fits cal: 490, 491, 500, 501, 502, 503, 504, 505 Versions: 25.00 mm. 470: 17 jewels (1955). 471: 19/20 jewels (1955). Versions: 28.00 mm. 490: 17 jewels, sub second (1956). 491: 19 jewels, sub second (1956). 500: 17 jewels, center second (1956). 501: 20 jewels, center second (1956). 502: 17 jewels, center second, date (1956). 503: 19/20 jewels, center second, date (1956). 504: 24 jewels, center second, date, chronometer (1957). 505: 24 jewels, center second, chronometer (1957). About our used parts! All our used parts are cleaned and thoroughly checked by a watchmaker, often they comes from a working movement. Minor imperfections may occur, but nothing that affects the function.