Quoted from Procrastinator:There isn’t a mark on the pin, other than the edge of the spinning house playfield (a new spinning house playfield is roughly $100).
Mine took a shot there too and lost a chunk. Apparently it's a common problem.
Good luck with your sale and I echo what SDpinballer said, I haven't even gotten close to SOTR. Then again, I find myself in front of TWD all the time.