I picked this up a couple days ago and would love to know more. Inside of the case back says 1660202 and the movement says Omega Swiss Made 17 jewel unadjusted. I googled 1660202 and found plenty, but couldn’t find any that includes the day as well as the date or with the gray dial like mine. Would love to know more. Thanks! https://imgur.com/gallery/PpazqRT
I don’t, I didn’t have the tools to take the case back off but dropped it off at the jeweler today and they called me with the info
Then they should be able to tell you the caliber of the movement, other than Swiss made with 17 jewels. That's what's needed.
I was able to find out it has the 1020 movement and the wrong crown but everything else is original and correct for a 70's era seamaster @redpcar @efauser