Archer
··Omega Qualified WatchmakerI take a look at crystal closely. It doesn't look like glass but acrylic crystal.
It should not be genuine?
Any easy way to distinguish glass from acrylic plastic?
If it is a ref. ST1510039 as Longbow suggested, then it should have a sapphire crystal. Crown with Onyx inset is the only one shown for this case, and is still available - part 069ST22063.
Cheers, Al