This is a revision of the original 1A11 Aircraft Specification given to the AIRPHIBIAN, N74104 by the FAA in December of 1950 which was the first AIRPHIBIAN registered was  the FA-2-101, , with a strut-braced wing . As you can see this is dated March 1975. I think it was done by Robert Fulton III when he tried to restart production According to the info at the FAA, this is for the FA-III with a cantilever wing ,N74153, and was certified by the CAA in June 1952

The Certificate Holder name is Taylorcraft, Inc, which bought Continental's assets in 1956