Ferrari only built four triple-carburetor, long-nose, torque-tube, aluminum-bodied 275 GTB Alloy by Scaglietti models, according to RM Sotheby's.
A different 1966 Ferrari 275 GTB Alloy by Scaglietti was auctioned at the 2014 Monterey Car auctions by RM Sotheby's and fetched $3,382,500.
This year's 275 GTB is still for sale but was estimated to auction between $2.9 million to $3.5 million.