Audemars Piguet, perpetual calendar, model:5549, 18K gold, unique piece, with a total production of only over 100 pieces and less than 100 in existence, 36mm diameter, total length 19.5 cm, adjustable from 18.5 to 19.2 cm when folded, good condition and case shape, the strap is thicker than the average one, the entire watch weighs approximately 120 grams.