This advertising promotion for the Northern Liberties Federal Savings & Loan Association is made of heavy-stock cardboard, unfolds to a 12-inch (or 12-month!) ruler, and features one of the most common ruler "jokes" (Your Rule for ...). The back shows how much money you would accumulate at 2 1/2% interest compounded semi-annually. So this ruler fits very well with my collection policy: Philadelphia-area advertising, made of paper, multi-function, and ruler humor.
Unfortunately I didn't note the source of this ruler; my guess is that it was a gift from my friend Susan, sometime in the last 25 years...
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