You make it sound like a PHV-1. My date of circa 1907-'08 is based on the W&C serial number on the fore end loop vs a list of serial numbers I saw some where. (Don't have the numbers here at the office.) Any body have dates for Evans' numbers?

How broad a term is "screw grip"? I've seen non-W&C actions that could be described as having a flange on the spindle to engage a third bite, often a rib extension rather than a doll's head..

How "complete" would it have been when it went from W&C to Evans? Stocked? (Guess you have to stock it before you can regulate it.) Finish? Engraving? It has the "Wm. Evans from Purdey" and the Wm. Evans serial number engraving on it.