The holy grail of restricted firearms [for this country] is the NAA [North American Arms] produced 1911 made for WWI made in Quebec. The war ended before they could get into full production so only about 100 were actually known to have been made.
In the eyes of the North American gun community the 1911 overall would be right up there. Although the Yanks would say the holy grail of the 1911 would be the WWII production 1911A-1 by Singer [Sewing Machine] company. Apparently, about 500 of them were produced and some even made it into active service. Hence, the reverance for that particular licenced clone of the great Colt/John Browning collaboration.
The rarest attainable 1911 pistol would be the Union Switch & Signal produced 1911A-1 for WWII military service. Approximately 50,000 were made and put into service. There are known examples in Canda but they are not common. One of the CGN members is fortunate enough to have one. I will let him post a pic of it...