1999 Seamaster identification.

During that period, Omega had case numbers (the 168.1622 number) and reference numbers, which weren’t the same. So, all mid-size Seamasters of the era had the same case number, even if they had different dials, bezels, bracelet/strap combos that had different reference numbers. Based on a quick google search, yours looks like Ref. No. 2562.20.00 or a variant depending on if it came on a bracelet or strap.

Any difference or change to the case over time, meant it had a different case number, so they definitely did not all use the same case number.

If the bezel was polished instead of blue, it's a different case number. Of even if the case looks the same but some design detail changes that means a new case number.


The OP has a mechanical watch, and the one you listed is quartz, so that's not it.

This appears to be a 2552200, and there were three different cases used.

The first iteration used a Cal. 1109, and had tritium on the lume pip - that is 168.1502.
The second iteration was when they changed to the Cal. 1120 movement - 168.1602.
The third is when they switched from tritium to luminova - 168.1622.

One thing to keep in mind is that what is stamped inside the case back is only a partial case number. So in this case the full case number for this watch is 055ST1681622. The "ST" in the part number indicates it has a polished steel bezel insert.

If you look at a 25518000 (the mid-sized Bond watch), it may also have 168.1622 inside the case back, but the full part number is 055SU1681622. The "SU" in the part number indicates it has a blue anodized aluminum bezel insert.

Cheers, Al