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Looks like someone scraped off the lume and glued some attractive small pieces of plastic on the dial. Martha Stewart perhaps.

 

Looks like an early dial and insert too.

 

The aftermarket bracelet and end links have a 7912 buckle attached to it. Crown is not Omega. Not the most attractive SM300 that I have seen.

 

Do they make these in Radium?

 

...
T Dial and the type 2 bezel and the hands are correct for the -64 subreference (65/66 production), and so is the 22.99x serial.
https://omegaforums.net/threads/opinions-on-a-seamaster-300-please.36252/#post-412256

Clasp is a 1506...and correct for the -64 ... But otherwise agree.
And yes condition and dial "lume" =

 

Yup. Meant a 1506 buckle. Thanks

 

looks like what could be described as possibly an old redial

 

Thought someone cut the Lum off a watch co dial.

 

haha...brilliant!