Chisel used by stonemason. It has a small squared blade, a squared shaft with two dimpled and serrated edges and the corners are chamferred. The end of the chisel is rounded to withstand impact when struck with a mallet. The mason's name is on the side.
Stone was worked using a range of tools including saws and chisels. Stone mason's tools have changed very little over the centuries. Finer shaping and detail was worked by striking chisels like this with a large wooden mallet.