At the beginning of Star Trek II: The Wrath Of Kahn, McCoy gives Kirk a pair of eyeglasses for his birthday. In Star Trek IV: The Voyage Home, Kirk sells the gasses to a 20th century pawn shop to come up with some quick cash. Obviously, this wasn’t just another pair of cheap eyeglasses because a pawn broker gave him $100 for them even without the lenses. Walk into a pawn shop with a pair of frames that have no lenses and tell the guy you want $100 for them and see how quickly he throws you out of the place. In the pawn shop, Spock asks Kirk, “Weren’t those a gift from Dr. McCoy?” and Kirk pops off the reply, “That’s the beauty of it. They will be again”.
Unless Spock’s time travel calculations are wrong in getting them back to their own time, and Kirk has the opportunity to relive his most recent birthday, they will not be a gift again.
Also, assuming that the glasses were 300 years old when McCoy gave them to Kirk (the first time), they’d be closer to 600 years old the next time Kirk got them as a gift.



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