The Holley model 852FFG is a governed 2 barrel carburetor used on various makes of trucks from 1946-1975. The carburetor number is typically on a data plate on the back of the carburetor. Holley carburetor numbers are discussed here.
The model model AA-1G is a similar design. It can be distinguished visually by the governor diaphragm position. The large diaphragm housing is parallel to the mounting flange on the AA-1G, but angled upwards on the 852FFG.
Model AA-1G carburetors were used on Diamond T and IHC trucks in the late 1940s to late 1950s.