Weird socket spring bars that I've never seen before.

[SuspectDevice]

As mentioned on another thread, I recently became the owner of a very large assortment of spring bars.

These were in the coffee can also but I've never seen anything that would use them.

Any insight from the pros?

 

 

[oldhippy]

Some old watch cases would have what I will call nipples molded to the case where normal holes would be for spring bars. What you have are female spring bars that would fit those cases. Here is the modern type used today. 

[SuspectDevice]

If anyone needs some of these I'd be happy to share.

I have no use for any of them.

It appears that the extended length for the most plentiful one is about 19mm & the compressed length is 16.6mm