My dads Omega from the 40s

Hi folks,

my dad showed me today his old Omega which he was given years ago.

I never knew that he owns an Omega (I can't remember that he ever wore it) so I was a bit surprised to see this old lady.

According to my reasearch on a journey through time the watch should be from the 40s.

I know that all things I would like to know like reference and caliber are visible after removing the case back. Any suggestions on the reference? (diameter is 34/35 mm)

Is the lenght of the minute hand correct?

As I am more into Omegas from the 50s/60s I would like to hear the opinion of the experts for Omegas of the 40s.

Thanks a lot.

Best
Duffy

it could be ref 2605. Had the same ref some years ago.