324.18.38.40.10.001Ref

A classic Speedmaster with a 38mm case, this model is driven by the automatic chronograph caliber 3304. Ref. 324.18.38.40.10.001 has a stainless steel case, alligator strap, diamond-set bezel, and a blue dial with Arabic numerals; ref. 324.15.38.40.10.001 is the same but with a stainless steel bracelet.