Imperial, Ulster, Vulcan, Walden, Schrade, Camillus and Kingston have been partners, bought by, sold to or owned by each other for over 90 years and the relationships were ever changing. One consistency over the years is that one of the Baer family always seems to be involved no matter what the company is called. The Baer's also brought the remnants of some great Sheffield firms and rolled them into the Imperial family. It makes your hair hurt trying to keep track of this so I don't.
Nice knife OP, probably 1950ish. Certainly after WWII due to the patent on the opener. I don't recall ever seeing the vertical USA though.
Bob
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