For anyone who is confused about Omega Seamaster calibres, there is a near complete listing, and parts list, at this site:

http://www.omega-fanatic.com/pages/gallery/omega-caliber-47032.

Many offers on Ebay omit the caliber because they can't open the watch (messes up the watrproofing in any case, if you are interested in that).

Many Omegas were produced, so prices are low in the price lists except for exceptional, mint or rare models. Some (many?) of the prices listed on Ebay are excessive.

Collectors seem to prefer plain steel over plated, because they can be buffed to remove minute scratches. (see olddude's).