Here is a recent find from a New York jewelry store crowded with all kinds of estate items--what appears to be an all-original Omega Seamaster Calendar cal. 353, with a Turler dial. It runs well, but the rotor is noisy and the dial slightly crooked in the case, so there may be some issues, we'll see. I am quite certain that the signed Omega crown is original, since it is the same as the one in this Swedish ad I found online. I will post more photos after I have it serviced.
What do you know about these Omegas that you would care to share? How much difference is there between the cal. 353 and the cal. 355 (the other caliber used in the Seamster Calendars with date at 6). Which is more rare, etc? I just love these watches! They look very masculine, with a hint of Art Deco.