Wilton started production in 1941, so it is a no go on the 1940 date. The 740 number should be a part number. The NO. 4 vise, as well as the other similarly numbered vises, NO.3, NO. 5 etc, were the first generation of vises built from 1941 to about 1945 or 1946. From there on, Wilton has changed the models a few times. Apparently, none of the first generation vises had dates on the long key that fits in the slide.
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