Caution! This cannot be sent to the USA. This is due to incomprehensible tariffs. Please understand. This is a Chronosport hand-wound pilot watch. This is a geeky watch for those in the know, but we think some of you may be looking for it. From information on the internet, it is believed to be ref. 31-HS04. The back of the watch is marked "C031-HS". The crown is unmarked. There is no brand logo on it. The color of the luminescent paint is different on the dial and hands, but it seems to be original at the time of manufacture since it is different on the other pieces. The most noticeable scratch is a line scratch on the crown side of the case. Please check the photos. The belt is an aftermarket cowhide belt (new). There are no accessories. The movement is in good condition. I have not measured the day difference, but I think it is within ±30 seconds. Personally, I did not mind the error at all. The movement is based on the Unitas 6497 and is the work of Helmut Sinn, who has converted it to a center-seconds movement. This movement has a hack function attached to it, which is quite unique. When the crown is pulled, the second hand will not stop until it reaches around the 60-second mark, and it is designed to always set the time at 60 seconds. (Worst case scenario is that you have to wait 59 seconds...) To international watch collectors - Please Note - Import duties, taxes, and charges are not included in the item price or shipping cost. These charges are the buyer's responsibility. Please check with your country's customs office to determine what these additional costs will be prior to bidding or buying. Customs fees are normally charged by the shipping company or collected when you pick the item up. These fees are not additional shipping charges. We won't under-value merchandise or mark the item as a gift on customs forms.