Thank you,hman!!!!
I'm afraid I have completely hijacked the original OP's post,but his question has been thoroughly answered at least.
I thought I'd mention how I invented a way to cut the complex angled morticed escapement in all those planes. We had no special plane making equipment,and I wasn't about to spend the next several months hand chiseling those planes!!!
I had thought about it a lot,and I do have a Bridgeport slotting head that mounts on the opposite end of the ram. I made some heavy duty wood chisels that would mount to the slotting head,and a very coarse toothed saw 1/4" thick and double sided that was used to cut the mortices wider where the wedge fit. You can see the wedges going into the mortises(escapements) in the picture. We made a few templates to draw the shapes of the escapements on the sides of the plane. Then,we drilled out as much wood as possible with Forstner bits,as deep as possible. I had a long 3/16" router bit I had gotten from a machine shop that made router bits for the furniture factories in North Carolina. I picked up many a reject from their scrap bucket. You can't buy a 3/16" bit this long. It was JUST long enough to rout up from the bottom of the planes,JUST past the crooked angle down in the escapement,where the mortise changes angles. The chisels HAVE to have a cleared area to chisel into,or they just would hit bottom with a clunk,and go no further. That router bit gave the chisels the needed cleared area to slice into,and provided the bottom area of the escapement,where the plane iron could come out of the bottom of the plane: The throat,in other words.
With the slotter,we were able to efficiently mortise out those escapements,and an added benefit was,there were no modern routed surfaces left in the planes to see. The planes looked hand made as they were supposed to look,being 18th. C. repros.
Sorry,I have no pictures to illustrate how the escapements looked,but they have several angles,and it was a head scratcher to figure out how to make them efficiently. The outsides of the planes were no problem.