Yeah, what the hell was I thinking of?
I appreciate all the feedback on this revolver, you guys never fail to amaze me with all your knowledge.
The Enfield is a pretty unique design, probably over engineered by American standards. The person I bought it from had it listed as a Webley and Scott. Was the Enfield design "borrowed"?

Should be late war time mfg in the 'S to 'Z' serial# prefix. Probably mid '42 to the end of the war.

2152, your are correct. The serial number is ZA3970 and on top of the barrel rib it is marked with a proof and "43".