The Speedmaster Professional ref: 311.33.42.30.01.002 was launched in 2015 as a replacement for the 3873.50.31. It features a stainless steel case with sapphire front and back and a leather strap. It is delivered with the new style box which contains a “NATO” strap, Velcro strap, a tool to change the bracelet and a book highlighting Speedmaster’s adventures.
