Thanks everyone. I appreciate all friendly comments and info. After some further research, I now can say my baby bullet was made in 1973. Turns out that, when Wilton moved from Chicago to Schiller Park in 1957, they had a ton a baby bullet body castings already made. So, they continued to used these premade castings that said "Chicago," even though the vise was assembled at Schiller Park. Hense, this explains why almost all baby bullets will have Chicago imprinted on its sides (some will say "Schiller Park," but they are less common than the "Chicago" babies.