The lume on your watch is 100% original and correct, and looks exactly the same in color as the lume on my 105.012-66CB. The date of production of my watch is listed as being in mid-1967 on the archive extract, with serial number beginning 2495xxxx. I suspect the lot (batch) of lume used by Omega during this time on both of our watches was the same, and furthermore, it's consistent with several other examples I've seen posted in this Forum, and of other reputable Swiss brands (e.g., early matte dial metres-first Submariners and GMTs):
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Also note in the two pictures above they're of my same watch, just slightly different lighting angle - not unlike a couple of
@JSlon pictures shared previously. So I suspect
@JSlon watch is of the same circa, which means that his lume is original. Most likely 1966-1967 production window, probably serial range is the same. Given this:
[1] your
most likely original bracelet was a 1035/506. Get one if you can, it will look great with your watch!
[2] it is however possible that your grandpa purchased this watch later, even as late as early 70s, and it's possible that the bracelet that sold to your grandpa was the 1171.
It's also important to note that you have all correct, original parts on your watch. Including the crown, pushers, crystal. It's important to keep these on your watch! Service replacement parts look ever so-slightly different, and more importantly, are not original. Also avoid Omega at all costs - they are outstanding for servicing modern, current-production pieces. But they will replace your original parts with service replacement parts. Many strong recommendations on this forum are for Al Archer,
@Archer , for very skilled, experienced, and sympathetic vintage servicing.
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