The V series revolvers (both USA and British) began at V1 (around 6/42) and production ended at VJ-day at about SV813xxx (although civilian shipments extended into early 1946. All could be considered as being "Victories" based upon the V prefix of the SN. Where did the "V" come from? I really don't know, but at the time, Churchill's famous "V for Victory" hand signal was very well known.
Winston Churchill's V for Victory sign had a very cheeky double meaning - Mirror Online