I have this old 60s 70s Ebel i know nothing about it. Watchmakers wont open it for fear of damaging it (insurance reasons) Only other thing i can do is send it back to Ebel. Jewellers think its 9k but i havent seen any other 9k Ebel watches just 18k and 14k? The hallmark is on the inside. Was just wondering if anyone had seen anything similar before?