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I looked at those for a bit too but nothing about it moves that way. The bolt would not move up and down, it would have to turnIt's a spring loaded Victorian ceiling or floor door bolt.
They screwed to the door at the top and bottom to secure the door on double doors.
2 examples to give you an idea....
Ahh that makes more senseThe "threaded" part is actually the remains of the spring.
These door bolts only moved up/down maybe a half an inch.
There was a push button on the top and a release lever sticking out of the slot to release it.
Maybe a bit of electrolysis will show more detail.
I had these on the front doors of the 1860's building we owned... Of course I could be wrong....