u/Serotonin-

So I finally found the keys for the safe. The top key can be turned once and then unlocks the mechanism underneath for the flat key. With the flat key, I can click some kind of mechanism, but unfortunately I don’t understand what I need to do at the bottom so that I can keep turning the top key and open the safe. The lower part of the safe has a different mechanism and is already open.

found in my grandma's basement, she would never throw away something that important but I have no idea what I'm looking for.

so can anyone here help me identify this safe? How old is it and how would a key look like?