Two 3-foot tall Davy lamps, which are the violate/inviolate mascots of the Royal School of Mines CSC. One is made of brass and one is made of steel.
One of these, "Real Davy", is worth quite a bit and currently MISSING. The other, "Decoy Davy", isn't worth much other than its scrap value and is therefore in the possession of the RSM.
It is believed that the frequent switching of which mascot is violate (typically whichever was captured by Guilds was declared involate) led to the Real Davy going missing.
A "Mini Davy", made by Christian Carter, is also currently missing.