Early McDonald's Restaurant Promotional Post Card - Never Mailed, Near Mint Cond

Early McDonald's promotional postcard. Late 1950s/early 1960s. Front of card pictures the old-style McDonald's restaurant which featured only carry-out service - no dining room or drive-thru. Reverse of card indicates that the card is good for a free hamburger (no expiration date is indicated!) as McDonald's way "of acquainting you with McDonald's tasty food," which implies that the restaurants had been around for only a short time when this card was produced. Even though it's likely that a large number of these cards were printed, it's equally likely that many of the recipients of these cards used them to claim free hamburgers. There's a mailing address that's partially preprinted and partially handwritten on the reverse of the card, although it doesn't appear that this card has ever been mailed. Near mint/mint condition overall. The photos are considered part of the description, so please look at the photos and judge the condition of the card for yourself. Thanks for looking!