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Original sheet of A.C. Gilbert "Tips" subscription coupons - probably 1920's.

As explained in the text box, young boys (sorry, no girls allowed, I guess) were encouraged to pass five coupons off to their friends and keep one for themselves, entitling each of them to a year's subscription to "Tips" magazine, containing tidbits relating to building and construction.

Of course, A.C. Gilbert was best known for their Erector sets.