Bingham Ltd was (still is?) a retailer & importer in Atlanta.
They used to sell any number of firearms accessories and parts, ammunition, ect. Most along the military/police type,,,tactikool in todays speak.
The 1911 bbl could have been from any number of large/small foreign or domestic makers. Simply bought and bagged by Bingham Ltd and resold.
They were one of the importers of the Italian made (Pietta?) 22LR cal smg, a PPSH look-a-like at the time.
It liked to go F/A due to some sear problems and went thru recalls, several redesigns by the mfg'r and very low opinions from the BATF.
They also were involved in a Fed court case over their sale of exploding tip ammo,,22rf IIRC, call Devastator in the mid 80's.
Very busy bunch!
There's also Squires Bingham Co,,,that's a Philippines co that took on the name of Armscor in a corporate reorganization.
That all occurred about the same time as the above but the 2 companys had nothing to do with each other.
The Squires Bingham Co did sell a 22RF semi auto PPSH smg look a like also. I believe it was the same Italian made copy as the Bingham Ltd gun. Squires also mfg'd in the Philippines a Model 20 semiauto 22rf rifle that was notorious for going F/Auto due to poor design. They made several other semiauto and bolt rifles in 22rf.
An AR15 look-a like in 22 was also marketed by them.