Hal Jordan as Green Lantern first appearance happened in the comic book Showcase #22 in 1959. The comic book is valued at 525,000 USD for those with a CGC (Comic Grading Company Standard) of 9.8, which means the comic book remains at great quality and with no scratches, dentures or damage whatsoever.
As per DC Fandom:
"An alien peace officer named Abin Sur of the Green Lantern Corps crash lands in the middle of the California desert. As he lays dying, he commands his power ring to seek out a worthy successor - one who proves to be fearless and strong-willed. Miles away, test pilot Hal Jordan is examining a flight simulator when a corona of green light envelops him, pulling him along with the simulator to the spot of Abin Sur's crashed vessel. Abin Sur tells Hal that the power of the ring selected him to take on the role of the Green Lantern. He gives him the ring, his costume, and a power battery. He instructs him that the ring will obey his every command but is powerless against anything colored yellow. He also tells him that the ring's energy must be charged from the power battery once every twenty-four hours. Hal agrees to accept the responsibility of wielding the ring in the cause of justice, and, with that, Abin Sur passes away. Hal Jordan is now Green Lantern."