There were 15,376 Triple Lock revolvers produced for civilian use. There's no way of knowing how many still exist today, but 75% is as good a guess as any. Slightly over 5000 additional ones were produced in .455 Webley for the British military and being used in the military, their survival rate is less. Even lesser are those that are still in their original .455 Webley configuration as many were converted to .45 Colt. (Many are stamped .45 ACP, but you definitely don't want to fire .45 ACP in a Triple Lock). Despite .455 Webley being rarer, .44 S & W Special brings a premium over .455 Webley.

As far as double action trigger pull, I suppose this is in comparison to other revolvers you may have fired in the past. Being double action, it's designed not to fire easily to prevent accidental discharge.

How did you do? It all depends on what you paid.

So, my question is what did you pay for it and where was it obtained?