Gold BNC Female Panel Adapter To Unidentified Connection

This is a pair of gold connectors.  One side is female BNC, the other is... well.... unidentifiable to me.   I've never see one like it.  But, the photos are clear, so if you recognize the other end, and can use it, this will be a bargain.

The panel mount includes the o-ring and nut.   There is a ctually a third connector like this (not shown) that is also in the bag, but it's a freebie, becuase it is missing the o-ring and the nut.

No warranty, no return.

Ships quickly and safely from Mississippi.