North Shore Farms store manager Anatoly Shashkin tweeted a photo of the coupon on Tuesday night and it soon went viral.
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He said a customer recently came into the supermarket with a coupon from 1983 to save 20 cents on Crisco oil.
The coupon from Proctor and Gamble had no expiration date, so the store decided to accept it.
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Shashkin said the coupon went out to the office where it will presumably get mailed out to the manufacturer.