When I said that I thought it is best if I stand back and read, it's because most of what I have can't be easily backed by cross-reference the way the info I post can be. Besides, maybe my views of Worrest are askew or inverted. If you guys unfold it, the way Revdocdrew's crew unfolded the damascus story, then I could quietly learn and save myself from eatin' crow publicly.
There are three models of Worrest triggers, the 1906, the 1907, and the 1912 models....I've only seen the 1912...and although I've seen 10 or so, everyone was the 1912 model, like the one I have posted pictures of (above)...I theorize (and I'll bet $10) that nobody can show pics of an '06 or an '07 because of the high failure rate. So in reality, when we talk about the Infallible trigger, there is only one...so why refer to it as the 1912? It's the "Infallible", and in my opinion, the most reliable single trigger mechanism of the era, maybe ever.
Also, to 2 Piper and DH...the Infallible can be made automatic reset if you already have an automatic safety. If your safety is not automatic, then you can still have the reset connected to the safety, but you have to cycle the safety to reset for the right barrel...which is alot easier than reaching for the selector...with an automatic safety, the only time you need to use the selector is when you need to shoot the left first...which is never, because we rarely shoot driven game, and the Infallible never balks.