Is this 70’s Omega Seamaster genuine

Hello omega forum !

I am fishing for my first Vintage Watch after reading the how to fish thread.
I am thinking about buying this watch. Is it genuine and is 500 € an ok price ? i do really like the aesthetics of the watch and the dial seems to be correct according to omega database.
It is supposed to be a Omega seamaster 166.0202
with cal 1010 movement

I also feel like Cal 1XXX has a bad reputation on this forum why is that ?

Thanks !