Omega

I have owned this 1966 constellation pie pan for the last 8 years and decided to send it for a service. I purchased the watch knowing the case was 18ct but I have been told by the person who serviced the watch that he thought it was unusual that it had a ...  

. . . were marked 'OM' on either side of 'Swiss Made', indicating 'or massif', a loose French translation of 'solid gold'. I don't see 'OM' marked on the dial, so I'm assuming your watchmaker saw a hallmark on the back of the dial. That would be unusual, ... 

Art, unfortunately the watchmaker only mentioned that the dial was hallmarked when he posted the watch back to me. I have a couple of images of the movement (561) taken prior to purchase but not of the back of the dial. The image I uploaded was taken afte... 

. . . produced roughly a decade earlier than yours. I'm unable to discern a hallmark (admittedly, the photo isn't entirely in focus). I'd wait until the next service to check the back of your dial. Not worth the risk of scratching the case, imho. Here's a...  

. . . ample evidence of mid-'60s Omegas with solid gold dials without 'OM' markings. After searching the internet, this popped up . . . . . . originally posted on a French watch forum, which was then shared on Omega Forums. If your watchmaker said he saw ...  

I appreciate you for looking further into this Art, especially as you have now found something similar on another forum. I will still get a photo of the dial when the watch is next serviced, just for reference. Would it be reasonable to say that a gold di... 

. . . and curious about the dial of one of my mid-'50s Omegas. I'll have my watchmaker take a look at it soon. Best, Art ...