Baz, “Shed”,
You are both wrong and both right.
The C1 is a C1.
Vulcan: Vulcan stock, full power spring. Safety.
Victor: as above, but Victor stock, lower power spring. No safety.
C1 (early): C1 stock, full power spring. No safety. 14” barrel.
C1 (late): as above, but safety.
My gut feeling is that most C1s were the early type, and that most of the later type went to the States.