Omega Genève 136.070 (1970)

Delighted with the hammered finish on this watch dial. But I’m only getting 10 hours worth of power reserve with this watch (after manually winding fully and wearing all day) - is it OK to keep manually winding it each day and any idea what the power reserve should be? Also noticed that the crown turns back, just a little, anti-clockwise on itself when I wind it, is this normal? Lastly the crown doesn’t to my eye look original to the watch - seems a touch disproportionately large - what do you think? If it’s not original any pointers on where I can possibly get the correct one from? Thanks, as ever, for any advice.

Hi,

usually the power reserve is above 30/35h.
For some movements is 42h. The fact that your power reserve is 10h means that the watch needs a new spring (and a service I would say).

The crown is from omega, however is not the one original on that model.

Hi,

nice looking watch, get it serviced and you have a good daily wearer...

Getting the correct crown: If you want to look yourself you will need the reference number inside caseback.

It determins the crown.

The rest is internet search...

Nice avatar!

I have one that looks similar but automatic with a 1481 movement