I think that's a big "K" with a lower case "L" for Klasse. I found "Kl" in my old Langenscheidt as the German abbreviation for Klasse. "Wk" may be for Werk, but that's just a guess. Perhaps that's why it's in such great condition; it was only used for classroom instruction and was never in the field?
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"I have never let my schooling interfere with my education." Mark Twain
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