Hi Guys You guys were able to determine this Omeaga was a Caliber 570 Reference 14725. But now I need to find a sweep seconds hand. As the dial is likely radium I'm not prepared to remove it from the case to take some accurate measurements. I measuring through the crystal & the hand would need to be around 13 to 14mm in length. Probably closer to 14mm. How do I go about finding the correct used/new sweep seconds hand?
Try searching on Cousins or Otto Frei. It's probably discontinued but it may give you the reference number at least.