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So far, my research is leading me to surmise that the blade was made by the H. Greenberg company in Solingen for Sears Roebuck which sold various items under the Acme trademark. Can't confirm any of...

Bold ACME logo in red on yellow plastic (perhaps Bakelite) scales. I'll take a picture later and send if anyone is interested. Looks like it could be from the 1950s or so. Found it at an antique...