On July 24, 2011 it was announced that a 2000 year old golden bell was discovered in an ancient sewer inside the Old City walls of Jerusalem (a few paces from the Temple Mount) last week. It is only one half inch in size. It contains a small loop on the top so it can be sewn onto a garment. Given the requirement for golden bells to be attached to the high priest’s robe, it is quite possible that this bell was once attached to the robe of one of the high priests.
Interestingly the bell still makes a sound!