Vintage 10K Yellow Gold Charm Agate Mason Keystone Pendant Fob

The agate stone has an engraving on the front that remains strong and black. The engraving is HTWSSTKS. The agate itself is in good condition with no chips. The the back layer of stone is a soft yellow with the front a white or clear in places. The bottom of the pendant has a mason symbol with a C or a G in the middle. The top loop on the pendant is marked 10K. 

.75" Height.56" Width at widest