Omega Constellation Chronometer

Hi, folks, new to the Forum - If anyone is familiar with this model, let me know. I do want to get it back in working order but am not sure if it is worth the effort.

The watch was my father-in-law's and passed down to me and I've for several years. It was running but not anymore. Trying to ID the model # but will not know until I have a certified Omega watch repair / restore facility take a look at it.
I've attached some pictures.
From what I gather this is what I know: Best Guess on age 1970 - 1972.
Omega Constellation Chronometer Electronic F 300 Hz Swiss Made 36 MM
Watch band marking has the Omega symbol on the outer band.
Band has the letters JB in a triangle, Triangle is partially covering the C in the spelling of Champion.
Below that is stamped Stainless Steel and U.S.A below that

Thanks for reading this.
Rob P

Thanks all for your reply's. Still gathering information but I'm getting closer than I was before.
Just a note Bruce235 - That web site/space has reached end of life and is no longer active.

Hi Folks - Still working on this watch ID. I'm really close and will open the back this week as I broke down and got the tool to open it properly. I live in South Carolina USA. Does anyone know of a reputable person who does repairs / servicing on the Constellation Chronometer Electronic f300Hz?