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The Ball Watch Ball Trainmaster NM9080D-S1J-SL 40mm Stainless steel Silver is a luxury mechanical wristwatch. On the secondary market, the Ball Trainmaster NM9080D-S1J-SL 40mm Stainless steel Silver averages $1,260 across 2 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.