Omega

... to have an idea if a hesalite crystal was already replaced or not even on modern models is to check if the logo is standing up (when the watch is looked straight in your face). This is not an exact science, of course, but crystals are assembled on the factory in a random manner, so the logo is almost always in any other position instead of "up in it's foot". I actually never saw a brand new example with the logo standing up. But of course, can happen, by chance. In the other hand, authorized services usually assemble the crystal with the logo standing up. This is not a rule, but it is usually done this way. This can give you a clue if even a modern watch may had its crystal replaced somewhere in time.

Also, to my strictly personal opinion, I see the hesalite crystal as a technical part, like a mainspring, let's say, and unless the watch is a real rarity, where original factory parts are a must, I actually feel relieved to find it have a modern, after-sales crystal. This may mean the watch was well cared, much probably by authorized services or very caring independent watchmakers. Finding an ordinary vintage with it's original factory crystal actuall gives me the sensation that the watch was less than well cared over the years. This can actually worry me a bit. Unless, of course, as said before, we are dealing with a rarity or even an ordinary vintage but never used, almost an NOS.

Best regards,

Adriano

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