Could use some expertise in identifying this vintage Omega.

Hello all.

I have a vintage Omega here that I could use some assistance with.

I took it to the Omega boutique in Manhattan two weeks ago and the watchmaker there opened it up to have a look. The movement is fine (works and keeps accurate time) but it needs to be re-lubricated and the seals need to be replaced. The acrylic crystal is cracked and needs to be replaced as well (obviously). Everything else is rock solid. They told me it's circa 1960s. Markings and all the numbers are as follows:

- Calibre: 601
- Case reference: 135012
- movement: 25026447

...... Aside from the above they told me that they cannot help with identifying or praising. Any thoughts?

Thanks for the replies.

I looked up the geneve line but of the few hundred models I saw none had numerical dials or hand like on mine. Plus the cases vary greatly. And yes, no luminous markers on mine.

Compared to all the others I have seen I am digging the look of mine the most. I'm more of a NATO/military style watch guy myself and when I get dressy I try to keep things as simple and dapper as possible as possible.
The numerical dial and red second hand add a touch of sport that I like.

So based upon what has been presented this far does anyone here have any experience with what market value on a piece like this might be?

I need to get a solid idea before I go putting any money into it.