Can someone identify the manufacturer or type of this carb. I cannot find any marks or tags on it.

The carburetor in your picture is a Model A Ford Zenith. The bottom half, the float bowl, should be marked in the casting with the name.

Correct about it being a Model A Zenith. You are missing the rod to adjust the GVA (gas valve adjustment, next to the choke wire). It works somewhat like the spray needle on a T carb. The adjustment screw with the spring is the air meter valve. Screwing it out allows more air into the idle jet ='s less fuel, turning in allows more fuel less air.
There are 3 versions of the carb, the Ford made ones are not marked on the bowl. They all used the same parts unless it is the early model (jets are different)

Thanks so much!!

There's another version of this carburetor that was introduced in 1931. It will work on all years of Model A. Due to the location of the sediment bulb, earlier Zeniths won't fit the 1931 cars that have recessed firewalls. The internals are the same as earlier versions.