Bronze Apatite Key Necklace

A vintage key on a chain with a beautiful bronze metal piece and apatite stone beads around the key and link.  The key is stamped with what looks like T3 or I3 but the 3 is cut off. 

Chain measures approximately 22 inches before the link, and then hangs down about 3.75 inches from there.  Key is about 1.25 inches long.

These are vintage keys (some may be antique and not vintage, I don't have exact dates for them), and they have signs of age to go with it, so please look closely at the photos.