I got this omega as a legacy from my grandfater, but can't find the specific model. Closest one I found was omega seamaster cal 267 ranchero.

 

Hi Felix, welcome to the forum!

All of the information you need to identify your lovely heirloom is contained on the inside caseback of the watch. You'll need to find a watchmaker in your area who can remove the caseback and provide you with the reference numbers. Those reference numbers will identify the exact model of your watch. The serial number on the movement will help identify the production year.

If you intend to wear your watch, please have the watchmaker service it for you. All of the moving bits inside your watch need to be checked for wear and tear, and then lubricated and adjusted before it can provide you with the correct time. Once this is done, you'll have a nice vintage watch to wear.

 

As said above get someone to open the case back from you and post some pictures, welcome to the club!