Hi! My name Is João and I´m from Portugal. I´ve inherited from my grandfather this 18k Gold Omega Constellation, caliber 561, case 168.004/14. It has unoriginal crown and buckle. This watch has a great sentimental value to me and I´d like to restore with the original correct parts. How should they look like and where can I find them? I´d be very appreciated if you helped me. Cheers.