Help identifying a 1970s Omega Seamaster

[JackReacher]

I saw this today in a local shop, no box or papers, in decent but not perfect condition. I have no knowledge about vintage watches, but love the retro 1970s style of it. Any ideas what the model and movement are? Seems relatively strong money to me but don't know the market. Are there similar watches out there from this period that offer better value, and what sort of service costs would they have at this age?
Many thanks

[Justayellowbadge]

Think that’s a 1040 calibre, a Lemania movement and Omega’s first auto chrono. Early 70s.

Nice thing.

Yep, an ST176.00x

See here:

https://www.chrono24.com/search/index.htm?query=Om...

Edited by Justayellowbadge on Monday 24th December 18:04