Megasonic 720hz caliber 1220 opinions and recommendations for service.

I’m really interested in a vintage omega constellation from the 70’s. It looks and is listed to be in great condition. However, after reading about the movement it sounds like there aren’t a lot of people out there who can service these anymore and parts are hard to come by. Does anyone have someone that services these particular movements well? Any thoughts or suggestions would be greatly appreciated!

Thanks in advance.