The Ball Watch Ball Engineer Master II Diver DM1020A 41mm Stainless steel Black (Ref. DM1020A) is a luxury mechanical wristwatch. On the secondary market, the Ball Engineer Master II Diver DM1020A 41mm Stainless steel Black averages $986 (range: $959–$999) across 6 active listings. When buying pre-owned, check condition grade, box and papers (typically a 10–20% premium), service history, and originality of dial and hands. Use the listings and price history on this page to benchmark fair market value.