Dingotech,
Your revolver started life as a .455 Mark II Hand Ejector 2nd Model and was built for the British or Canadians in WW I. It was obviously rechambered to .45 ACP, which was much easier to find in the US. Avoid shooting the hotter +P .45 ACP ammo in your old gun.
Enjoy.
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John 3:16
WAR EAGLE!
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