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The Ball Watch Ball Engineer II GM9100C-S2C-BER 41mm Stainless steel Blue (Ref. GM9100C-S2C-BER) is a luxury mechanical wristwatch. On the secondary market, the Ball Engineer II GM9100C-S2C-BER 41mm Stainless steel Blue averages $2,954 across 1 active listing. 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.