Back in 1999, when the Celebrate the Century 1960s stamps came out, my printer at the time wouldn't print fewer than 50. I only wanted to service 25 for the CTC Moon Landing stamp. But like any good collector, I couldn't throw away the other 25 cards. These are those cards, with the 2019 stamps.
Also back in the not-so-good old days, multicolored printing was prohibitively expensive, and using any color ink other than black cost $25 — to wash the colored ink off the press after use. So I hit upon the idea of printing the five CTC 1960s designs on brightly colored cardstock, using "psychedelic"colors." Others used were yellow-green (Star Trek), bright yellow (Beatles), orange (Martin Luther King and the March on Washington), and bright turquoise (Roger Maris' 61st home run).
I still have the extra Maris cards, but haven't used them yet. C'mon, USPS: Next batter! Next batter!