Flat Belt Pulley. Here we have a genuine original cast iron pulley, it fits a 1 1/2 inch shaft, it's a 5 inch pulley and is 4 1/2 inches wide where the belt runs. However it does have a very small crack just at the start of where the Woodruff Key fits, someone has hit the Key in to hard. But it's only a chip and if fitted towards the Flywheel it won't be noticeable. The rest of the pulley is fine.