The marking underneath the buckle is a part number, not a serial number. But it appears correct.
Check the inside of the lower flap of the strap, that's where mine has "Omega" printed along with the P/N and other information.
As for "TPO" it looks like that was embossed, perhaps the seller's initials? Omega Boutiques will emboss the keepers for you like that if you ask them to.
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