Last time I used a ridge reamer was on an MGB block back in 1999. Not much of a call for those old tools anymore, but sure nice to have when you do need one. Unfortunately I can't help you out on this slip knot, I only have older Craftsman versions.
Interesting observation on the Crafty wrenches. Just goes to show the difference in geographic markets. Vintage Craftsman anything (especially wrenches and sockets) are hot sellers at the flea markets and yard sales where I live. People want crazy high prices for their vintage Crafty tools, and they're getting the money. Recently saw a well used 1960s era 1/4" - 1-1/4" raised panel combo set go for over $100 at the local flea market -- crazy!