DUFEAU/SWISSAIR nearly mint aviation-watch Type 31, self winding, Switzerland around 1996, reference SR223-56, stainless steel case including original leather strap with original buckle, screwed down case back with representation Douglas DC-3 & winding crown, silvered dial colour tinted, display of hours, minutes, sweep seconds & date, bidirectional revolving bezel, 25 jewels, calibre ETA 2824-2, diameter approx. 38 mm, original box & papers, condition 1-2, property of a collector