Tony, Wisconsin used a lot of Bendix-Stromberg carburetors in the 1950s and 60s. It probably fit a ACN, ABN or BKN. Hard to tell without knowing what model it is. Are the throttle/choke shafts seized up? Both control levers appear to be missing.
i don't know what it originally fit but as a teen i had one and put it on a 4/5 hp tecumseh on a small riding mower that i used for a gokart i used a wire for throttle linkage, no governor. it was something my uncle had got somewhere he did construction in the 50s and 60s. i think off a cement mixer since it had a little cement on it and some yellow paint. it was probably off a wisconsin since it was in with some other wisc. parts.