18KY Push/Pull Tube 5mm Base-Bottom Slot Safety Catch

Handmade in France, this 18K yellow pin stem safety catch is the ultimate in broach security.  Has a 5mm base with a slot on the bottom.  To open the safety catch one has to pull the pin on the tube that slides open the slot.  If tensioned correctly, the pin stem needs to be push down slightly and moved to the side to become free from the catch.  
Should be disassembled before soldering to protect the internal spring.  After attaching to broach, pin rivet should be finished.