Rosemont Alliance got to $500,000 for first I Am Invincible colt at Premier.

The first son of reigning Australian champion sire I Am Invincible to be offered at this year's Inglis Premier Yearling Sale lived up to its high billing, becoming the first half-million-dollar lot of the sale.

The Yarraman Park-prepared youngster, who is from the Not A Single Doubt mare Pretty Cury, sold to the Rosemont Alliance just an hour into the session.

As impressed as Anthony Mithen already is with the colt's physical make-up, he is expecting him to blossom in coming months.

"I think probably the most telling point about this horse is that he's a sixth of November foal, so he's got all that development to come, but he looks a ready-made one right now," the Rosemont principal said.

"I can't wait to see him once he goes through our breaking system and has a couple of mini preps at the farm. I reckon we'll be seeing a pretty stunning product."

The colt will be trained by Peter Moody, who Mithen was not keen to get in a bidding duel with.

"Moods and I had a yack a couple of days ago, as we do, and the talk turned to horses and yearlings and we said, 'what do you like?', and we both revealed that we were keen on him."

The Alliance's first big buy of the sale is the fifth foal from Pretty Cury, whose four to race are all winners, the best of whom is Solar Star, a daughter of Zoustar who won the Listed Gai Waterhouse Classic in 2020.

Another of Pretty Cury's progeny is Key Largo, who is also by I Am Invincible, and finished sixth, beaten just 2-3/4 lengths by Passive Aggressive in Saturday's Group 2 Challenge Stakes.