The serial number book says it is a 2CHL vertical built in 1955, #4 in a lot of 10 machines. The CHL is later version of the 2HL with more distance between the quill and the table, larger tble screws, hydraulic table feeds, etc, and a heavier machine. There is also a 2HL vertical on ebay, #12 in a lot of 20, serial #4206 built in march 1943. This is listed under Milwaukee. Glad to see this site!! I'm a real fan of K&Ts. Curretly I have a 2CH and a 4H, both horizontals. The 4H was made in 1939 & is still in excellent conditon. Probably because it does not have rear controls so nobody liked to use it. I'm in the process of putting a 5HP Bridgeport style head on it with 40NT spindle. Should be the ultimate mill for me! I'll send some pictures along when it is done.