Calibre numbering Personalised Omega movements. Calibre's concerned: 861, 863, 1110, 1111, 1140, 1150, 1154, 1155, 1378, 1379, 1430, 1432, 1438, 1455, 1470 Calibre Numbering Subject The above mentioned Omega Movements have received quality enhancements: changing the older gilt or simple rhodium-plated versions to high-grade rhodium plated versions. These modifications were started in 1995 on the mechanical movements.   On the new versions, the basic calibre (ETA) is no longer indicated.   Decision   A new codification of the calibres concerned (see list). Notes The bridges, main plates and electronic circuits are specific to a particular calibre and must not be used on other movements. Only the basic components are interchangeable. The existing technical documentation remains valid. Conversion Tables Old Number > New Number 861 1861 863 1863 1110 1108 1111 1109 1140 1141 1150 1151 1154 1164 1155 1152 1378 1478 1379 1479 1430 1530 1432 1532 1438 1538 1455 1456 1470 1471 New Number > Old Number 1108 1110 1109 1111 1141 1140 1151 1150 1152 1155 1164 1154 1456 1455 1471 1470 1478 1378 1479 1379 1530 1430 1532 1432 1538 1438 1861 861 1863 863

-- Chuck