DALLAS— The space suit patches from Buzz Aldrin’s Gemini 12 space suit, presented by the astronaut to his parents as a Christmas gift in 1966, are estimated to sell for as much as $75,000 at a public auction Tuesday.

Aldrin’s patches—given to his parents “with a grateful son’s love,” according to the inscription—are among the more expensive items available Tuesday at the Heritage Auction Galleries sale of air and space artifacts.

The priciest item looks like a dustpan with a foot-long aluminum handle. It’s actually a scoop used by astronauts Alan Shepard and Edgar Mitchell to pick up moon dust on the 1971 Apollo 14 mission. Its estimated worth: as much as $300,000.

Other items being auctioned include an American flag that went to the moon’s surface on the Apollo 14 mission, a pair of needle-nose pliers from Apollo 16 and a lunar chart used during Apollo 17.

“When one considers ... just how few actual objects have been off-planet, it’s amazing to think that any of us would have the opportunity to actually own one of these incredibly rare pieces,” said Tom Slater, director of Americana auctions for Heritage.