Re: Another Iver Johnson/US revolver question
You wont be able to ascertain as to whether a part was made during assembly of the weapons or prior to that because they continued building the weapon in the same fashion. For example that flat mainspring on your US Revolver was discontinued on the I.J. brand in 1909 with the 3rd model. I have a set of these myself which I have fired on 2 or 3 occasions just to try them out breifly but I keep them as mainly just as part of my collection. The same goes for all my Iver Johnson weapons. Why wear it out if it isn't allready or risk having a part break that may be hard to find a replacement.
If you're prepared to shoot someone to defend your castle then these should not be your 1st or last resort unless they are all you have, IMO.