My latest acquisition, a Webley Mk I still in .455...
I believe it has been re-arsenaled, but not updated to a Mk I* (a dovetailed hardened backplate installed and in some cases the hammer is replaced, essentially turning it into a Mk II). The Mk I was approved in 1890 and approximately 40,000 were made. The vast majority have been re-arsenaled.
The holster, a 1943 Canadian canvas one for a Mk VI variant, was included.
It's my fourth Webley. I have a 1918 Mk VI also in .455, and two Mk IVs in .38/200.
Cheers! M2