Thanks for posting your Fairmount collection; very handsome and very unusual indeed. I noticed your Fairmount angle wrenches are of the V-gullet design with narrow beams but the other wrenches are all U-gullet with broader beams. I wonder if that means they were made at a different period of time or if they were made by a different OEM?
I have a few Fairmount wrenches, but they are extremely rare down here in Tejas. The good news is they can be had for reasonable prices because the sellers are totally unfamilier with this brand.