Pre-owned Omega Speedmaster Calibre 321 ref 311.50.39.30.01.001 is a remarkable tribute to the very first Speedmaster from 1957, the legendary CK2915. Omega designed this model to celebrate the collection’s early history while showcasing the revival of the historic Calibre 321 movement, the same chronograph architecture that powered the original Speedmasters worn during NASA’s early space missions. The 38.6mm case is crafted entirely from 18k Canopus Gold™, Omega’s proprietary white gold alloy known for its bright tone and durability. The dial is made from deep black onyx and decorated with applied indices and hands in white gold treated with Canopus Gold PVD. Vintage-inspired details appear throughout, including the classic “oval O” Omega logo and the tachymeter bezel with the famous “dot over ninety.” On the caseback, a sapphire crystal features an engraved Seahorse with a blue sapphire eye, marking the Speedmaster’s 65th anniversary while revealing the beautifully finished Calibre 321 inside. It’s a luxurious modern interpretation of one of the most historically important chronographs ever made. Shop OMEGA Speedmaster Collection