Thanks Grant
This is why I asked the question - something didn't seem right with this original data plate - the MB-F1 came later than the manual which I originally assumed went with that parts list.
http://gallery.me.com/oldcmp.net/100...7-0001/web.jpg
So the assumption is this is what was issued on very early cab 13s before the individual spare parts lists. Fascinating!
Here's another unusual one - this is for one of the modified conventional Fords I think:
http://gallery.me.com/oldcmp.net/100...4-0001/web.jpg