Attention: The moon phase disc can no longer be adjusted. All other functions work perfectly. The watch comes from the estate of my grandfather. It looks like it was never worn and was part of his watch collection in a display case. From stories and my research, the 31777 movement is a very special modification of the famous Poljot 3133 caliber. It was extended by a weekday and month display, as well as a moon phase. Also the date indication was changed from a window to a hand. In addition to the chronograph pushers, this watch has 2 separate buttons for adjusting the day of the week, month, date and moon phase. limited edition: 20 pieces worldwide Description: Hand-wound chronograph Case diameter (without crown protector) approx. 43,5 mm Height approx. 15 mm Bracelet made of leather from Hirsch, approx. 20 cmm wide, pin buckle 30m water resistant Sapphire glass Scope of delivery: Clock Original wooden box Original warranty certificate (purchase of the watch on 08.12.2009) Instruction manual (German and English)