system
Given the following post, respond as if you're commenting on Reddit:
human
[Back to the Future] If Marty wanted to get some good money without betting on sports/lottery, what could be bring to the 50s that while valuable, won't raise suspicion on him?
gpt
The trick is to take things to the future, rather than the past. You could get a lot of cash for a mint condition piece of memorabilia from the 50s. 

This is the trick used in Goodnight, Sweetheart to great success. The protagonist of that show actually ran an antiques shop in the future, which was stocked with an astonishing array of items all in perfect condition, almost as if they had stepped through a door (technically a wall) from the past just that morning.