Annapolis
·Deleted—errant post about a different ref.
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Here’s a weirdness: the one that Millenary reviewed also seems to have lacked those markings. This could just be one of those things
https://millenarywatches.com/speedmaster-sapphire-sandwich-006/
In the world of vinyl records, if you have one in which the manufacturer made a mistake, and something is missing (like a wrong label), it will often make it rarer, more desirable and more expensive.
The engraving can’t be seen when you’re wearing it, so I’m a bit surprised at the number of folks saying to send it back. If you get a letter from Omega acknowledging it as a QC defect, and were otherwise happy with the watch (and not planning to sell it), I’d keep it… No need to risk getting a new example with a new, more obnoxious QC issue, like a slightly-off-center chrono seconds hand that is “within tolerance,” or any number of nitpicky issues that would be visible when wearing the watch.
Respectfully, this is bad advice and I hope OP does seek a return/refund. This is a pretty bad QC issue and is not easily fixable like a misaligned hand. There’s a 99% chance any other example would be better than this one.

Hmmm… We appear to have different definitions of the word “respectfully!”
Not such a bad defect in my book if it can’t be seen when wearing, assuming it is acknowledged by Omega as a QC issue, but it is OP’s call and I can understand why it would be a dealbreaker for some owners.
and the absence of the lettering wouldn't enter into the value equation.