bit of a wire brushing and was visible on the back of the middle board41’s are shallower than 39’s and are the better of the two for match work. I wore out a pair of 41’s that dad originally used and replaced them with idcp7. Definitely better at 10” for match work in the vintage class! Pop a picture up and I’ll can tell you what you have! Steel points and shares plough a lot nicer but are very hard to find now!