Interesting, doesn’t look like the key to a safe. Maybe, a room or key to a home.
Like the idea of it being a tool for something rather than a key to open a door, and I like sardines but thinking lantern adjuster or gaslight tool... but a wild stab at that
Not a sardine can key. It has to have a slot in it to hook the end of the lid to roll it up on. I ate too many sardines out of those old cans!
Being small it looks like a key to and old wind up mantel clock, not having to turn with much force to do the job? Just the clock hands to the right time!
double bit key that was used on clocks, jewelry boxes, bureau drawers, and some chest locks.
