Colt Manufacturing was started by brothers Warren and Wally Johnson around 1962. The Johnsons were pioneers in the use of hydraulic drives, which were used on their tractors. In 1963, production was moved from Milwaukee to Winneconne, Wisconsin. The following year, Case purchased Colt and tractors were sold through Colt distributors under both the Case and Colt brands. In 1966, the Colt name was dropped and Case-branded lawn tractors were sold through Case dealers.
Cast-Colt Lawn Tractors - collector's site with photos