A Schwab "FireGuard" safe.
It's at least 30 years old, possibly more. It's about the size of a refrigerator. It's been in one of my garages for a couple decades. It has a UL tag inside the door that says "Listed Relocking Device" and has a stamped serial number. Model number sticker says "2557 CTS." The outside door panel says, "FireGuard by Schwab 150F-1hr."
It has an SG mechanical combo lock, three locking bars (one on top, on the side, and on the bottom). Inside the safe is another door (with no lock), that opens to a smaller interior.
My dad acquired the safe from a friend who was cleaning out either a bank or an insurance company. When I bought the garage from my father 11 years ago, the safe went to me. I had forgotten all about it.
ETA: looks just like the one on the right, only perhaps bigger.