Perhaps a watchmaker is your best option.
If you’re patient and would like to do this on your own, this tool is awesome
https://omegaforums.net/threads/pah...die-caseback-opener-highly-recommended.39120/
You take it to the watchmaker.
There is no reason for a user to open the case. Any attempts to open it risk irreparable damage. There is also an inside dust/magnet cover which hides the markings and such. The risks are simply not worth it.
There is a reason these use special tools to open.
Edit: post photos. There are people here who can tell a lot from the outside case photos.
At least it looks like it is made from soft metal. So many watches have the scratches from using the wrong tool. Usually the adjustable ones used for removing lens retaining rings.
One thing I have learned here, is that just because a tool exits it does not mean it is the correct one to use.
Can anyone here tell me what model it is from this pictures? Sorry for the poor quality
You have a 145.022, which based on the limited clues and horrible photos, I’d say falls between the late 70’s to mid 80s. But you really need to post better photos when you can.
