Carriage-maker’s moulding tool

Description

Haven’t got the foggiest idea how this might have been used, except it looks to be a kind of beading tool used on curved surfaces when making carriages.  Surprisingly, there’s not a lot of documentation on carriage-making tools.  This is a manufactured product, marked “3/4” (which is the size of each of the double beads it would cut) and “87” (presumably a model number).  Interesting curiosity and I’d like to know more about it.