An approx. 1911 Lancaster Arms Co. catalog shows a Daly Diamond Grade on the cover with the Infallible trigger and it notes Offices in Lancaster, Pa., 302 Broadway in NY, and Suhl in Prussia was noted as their Foreign Office. It would be my "guess" that the workers in Suhl , who could make the magnificant Diamond guns, could and should easily install the Infallible trigger in Suhl. Altering a Suhl finely finished gun in the US before it is given to the first owner makes no sense to me. Just my guess,though.

In another thought, I have had several Bakers with Infallible triggers, and they worked fine.

http://www.bakercollectors.com/