I bought myself a cheap Chinese three pronged case wrench and opened up my eBay Omega Bumper.
It is running a little fast, so I wanted to adjust the little lever.
Nothing got harmed. I made a little push on the lever.
Now let's see if anyone can help me figure out the year it was made.
The movement is marked Cal 351
It has a long number on the movement 12437976
The case is marked C-2577-2