From my personaly collection comes this unique watch. Sofar it's the only known example... it's a stunning Longines 13ZN Flyback Chronograph with 'Disco Volante' / Flying Saucer 18K case ref 4466. It was made in 1940 and sold to Argentina (where I bought it). It's unique in case, also since it's large; 37,5mm excl. crown but also the dial is unique! It has a black outer Respitations scale and inner blue Pulsations scale. Inside a mirror seconds ring with small subdials and stunning blue hands. It probably belonged to a very stylish doctor who specially ordered this watch to use as an elegant tool. The beautiful 13ZN movement is as most of you know considered as one of or maybe the best Chronograph movement and it's in super condition. The watch comes with an original period box, period style strap with Longines buckle and a Longines extract. Doesn't get much better than this...