.

gatorcpa

He is saying that the dial isn’t correct for that production run (the -21 on the case back).

Omega did not keep track of which dials were used on particular production runs.

Here is a watch with the same style with 3-6-9-12 numerals.





This is close enough for me.
gatorcpa

jeppehh

I originally thought that the 2505 referred to the case and the -xx to the dial layout.

The few -21 I have seen only had the Arabic number at 12, but as @gatorcpa is indicating Im likely to be wrong.

This is an example of the layout I’m referring to:
https://omegaforums.net/threads/omega-2505-21-jumbo-38mm-calatrava-style.87437/

If the dial is correct and the watch is running I would be happy to pay 400. Not as an investment but because it’s a lovely watch to wear.

gatorcpa

The older version of the Omega Vintage Database used to have a caveat on every listing that said “Other Dial Styles May Exist”, or something to that effect.

The meaning of the numbers after that “-“ or “/“ may vary based on the case reference or date of production.

Consistently inconsistent.
gatorcpa

gatorcpa

Maybe original, maybe not.

They were switching over at that time.
gatorcpa

Benbradstock

I agree that none of those three watches are nice examples. In addition to the possibility of water ingress on number one, it is overpolished and worn out. I would advise taking your time educating yourself, and then patiently and persistently hunting for better examples. Alternately, if you’re feeling impatient, buy from a reliable dealer (Omega Enthusiast may be a good choice here) and prepared to pay the premium in exchange for some assurance of authenticity, condition and service.