master 38MASTER COLLECTION. Ø 38.50 mm - Automatic watch. Stainless steel. $2,650.00. Shop now. MASTER COLLECTION. Ø 34.00 mm - Automatic watch. StainlessFirst launched in 2017, OMEGA’s Speedmaster 38 mm collection offered OMEGA fans a luxurious take on the chronograph’s unmistakable look. Especially popular was the Speedmaster 38 mm