another Omega part i've found in the stash

I believe its a Omega case ref. 2589 shame there's not the full case

 

Did Deniston cased watches carry Omega 4 digit model numbers? I thought they didn’t.

 

Dennispn cased Omegas did not have a Swiss ref number. Sometimes you can find close match, but like French cased Omega, they did not have a model number like the Swiss cased Omegas.

 

Certainly the 2 gold ones I had didn't have case numbers, they had their own Dennison model number, 13322 in my case. That one above may be Dennison model 503?

 

i might be wrong i just saw a picture of one same on net