470? 25mm movement, Quite a small case then?
The dial is stained and dirty, it’s pretty far gone. It may look charming in hand but it has a lot of patina.
Omega info
https://www.omegawatches.com/watch-omega-seamaster-omega-ck-2828
The 470 has the virtue of being the first Omega full rotor auto but tends to be found in smaller sized pieces. The full size version was the 500 series. If as I suspect this is a circa. 31-32mm piece then it won’t be massively desirable to a modern audience (well the male half who tend to buy most vintage watches). Just managing your expectations, sorry if the news isn’t great.
http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Omega_470