The Ball Watch Ball Engineer II NM9026C-S6CJ-IBE 40mm Stainless steel Black and Blue and Green and Gray is a luxury mechanical wristwatch. On the secondary market, the Ball Engineer II NM9026C-S6CJ-IBE 40mm Stainless steel Black and Blue and Green and Gray averages $1,713 (range: $1,173–$2,614) across 11 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.