Nice watch Jaroslav, I've have a couple of these over the years. I really like the gold / stainless combination on them. This one appears to be in very good condition.
An excellent quality modern watch with the ETA 2879, the slower (21,600) beat version of the 2878. These were made concurrently with the more well known ETA workhorse, the 2824, which boasted the faster beat rate of 28,800. Very underrated, in my opinion, these watches and the Sevilles were top drawer and to get this kind of quality today, you would be paying upwards of $500.
Oceanographer it is.