I have two Warriors - an earlier model with no s/n and with the characteristic chamfered cocking lever and a later model without the chamfer, s/n 2682 (this info I posted on here 22/7/16). However, looking at Hiller's book again he says a further means of distinguishing between the older and newer models is that on the early models, ".....the barrel protrudes about half an inch (about 1/8" actually) whereas on the later model the barrel was encased in a square projection and did not protrude.......".
On mine the reverse is true - the later, numbered, model has a slightly protruding barrel and on the earlier model the muzzle is recessed, so did Dennis get it wrong?
Aubrey