Is this Admirality a good buy?

I've been offered this Omega 136.015, cal. 613. Having little experience with these I would appreciate your opinion before I dive in. Here are my thoughts:

The calibre matches the case and the serial number (which I make out to be in the 29 millions) seems to be in line with the time of production. Case to me looks quite sharp and fat which is a good sign. From my limited experience the dial does not look redone. It has some spots but I suspect that they could very well just be dust particles which could be removed. All in all not a bad watch that would clean up nicely unless I am missing something (which could very well be).

The seller is a watchmaker and the watch comes serviced. Priced at 750 euro, would you say its a fair deal?

Thank you

it looks like a honest watch to me, as you point out edges look sharp, dial quite clean - overall fine condition
if you like the watch 750€ is okay, maybe in the high but that doesn't matter if you keep it for a long time

Thank you everyone for your time. I think I'll pass on this one.

It's a rare model tho, 350-450 seems low