Omega and Lemania jointly developed an automatic chronograph movement for introduction in 1972. Cal. 1340 was introduced first, with Omega using the similar Cal. 1341 as their Cal. 1040/1041. It is a cam-switched automatic chronograph and closely followed the introduction of the Chronomatic and other famous movements.
Cal. 1340 has an unusual arrangement of hands and subdials. It is a 2-register movement, with 4 central hands and subdials at 6 and 9 on the dial