The British auction house Christie’s plans to sell the skeleton of one of the largest known Tyrannosaurus rexes in early October, the company said on Wednesday.

The dinosaur known as “STAN”, approximately 67 million years old, was discovered in 1987 in South Dakota by amateur paleontologist Stan Sacrison.

“He showed it to scientists at the time who unfortunately misidentified it as a triceratops,” James Hyslop, Christie’s head of science and natural history, told Reuters.

STAN is 40 feet long and 13 feet high, Christie’s said. He is also notable for two fused vertebrae scientists have identified in his neck, suggesting the dinosaur broke his neck and survived during his lifetime.

Christie’s will display the dinosaur from Wednesday to mid-October at its Manhattan, New York, location, the company said. It plans to book socially distant viewings for the public.