This number is stamped on my stainless prop. I just spun the hub today and a very nice family towed my 21' Tracker Party Deck all the way across the lake so I could limp on in to the launch. They would not take money or anything. Many thanks to them and I will pay that forward one day. This prop is rough and needs to be retired to spare status. It performs very well but has a vibration, so I want to replace it exactly. The local prop shop says around $400. Opinions?