Does anyone know if the Navitimer 81600 is suppose to have a perfectly flat or slightly domed crystal. After looking at thousands of photos, I am no closer to the answer, as I see both. I have been led to understand that the watch originally came with a slightly domed mineral crystal, but over the years many where replaced during service with a perfectly flat sapphire crystal. If anyone knows the truth of the matter, I would appreciate your advice, and if possible a part number of a crystal, whether OEM or aftermarket.
