Hand-wound "Power+" version of the SW200-2, listed by Sellita in its "SW210 et SW200 M" family as the successor to the SW210-1. Factory sheet: casing diameter 25.60mm (11 1/2 lignes), overall 26.00mm, height 3.35mm; power reserve minimum 62h, typical 65h; lift angle 50°; stop-second; fine timing device; minimum 37 crown turns to wind. Sellita lists "a" (date, quick-set) and "b" (no date, two-position stem) executions plus small-seconds "S" versions; functions above are the dated "a" execution. Grade ranges are the datasheet's mean rate ± tolerance. Family set to "Sellita SW210" (the hand-wound line it succeeds), matching Sellita's own "SW210 et SW200 M" grouping.