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... I was wondering what the year was that this was created...
Since this question hasn't yet been answered either in previous posts or on the Numista page, I would answer that the statue of Ben Franklin in the Institute's rotunda wasn't officially designated as the "Benjamin Franklin National Memorial" until 1972, and since it's called the "Memorial" on the medal I suspect this is your earliest possible date - though of course may have been sold as a souvenir over many years or even decades. I would assume it was actually sold as a souvenir there at the Franklin Institute.
"Errors" on medals generally aren't as interesting or valuable to collectors, since quality control at a private medal-maker is not expected to be as high as a government mint. There's also nothing stopping a private medal-maker from deliberately making as many "errors" as the market wants. Low demand, and potentially unlimited supply. It would have to be a particularly egregious error (such as mis-spelling his name "Fraklnin" or some such) to get any premium as an error/variety.
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...Just seeing damage from circulation.
Technically, since it's not a coin, does not really resemble a circulating coin, and therefore almost certainly didn't "circulate" in the economic sense, we'd normally call it "wear" rather than "circulation". It is very strangely worn though, for an item that theoretically should not have seen this much wear - perhaps someone used it as a pocket piece, or had it jingling around in a coin tray in a car or some such for many years.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis