Got a pair of basic 36H wheels with 7s screw on freewheel. Basically unused, came off a Dawes utility bike. Say £20+ postage?
IMG_3178 by Paul Gray, on Flickr
I think the only time you see replaceable bosses is on aluminium frames as you need the canti boss to be steel. I'm happily riding a 1990 Marin frame as my tourer, which has now done 20+ years with Maguras without any boss problems.
Here are the pedals, say £20 posted? Clips are somewhere in a toolbox, no corrosion or flaking. I can add some black leather Christophe straps too. One end cap is an MKS one.
Certainly there are also transition models - clearly they evolved stuff with small differences between production batches. My P7 has 96 decals (round orange script) and date code but a canti hanger like a 95.
So I agree, it may well be some kind of halfway model.