The ref 2375 houses a cal 28.10 movement. The 28.10, along with the cal 30.10, were the first Omega automatic movements. The 28.10 was renamed cal 340 in 1949 and was the base for the many of the well known bumper automatics such as 341- 344 and with center seconds for 350-355. This example is in stainless steel from the late 1940’s. While the dial is not in the greatest of conditions, it is original and therefore will not be refinished.