Strong result £67k gbp
Later dial I think, always thought the 67 issue had 12 dials.
Link here;
https://www.phillips.com/detail/omega/HK080220/945?fromSearch=Seamaster 300&searchPage=1

 

Yours have a 12 or BT dial?
My own BT (1970 issue) is here;

 

Good old acquaintance.

That watch is shown in John Goldbergers book "Omega Sportuhren" from 2007. And was already sold once at Phillips about two years ago for 60k EUR, now sold the second time for 74k EUR... a 12k EUR gain per year is indeed pretty strong.

https://www.phillips.com/detail/omega/NY080118/20/