For sale is a Swiss-made Sinn 103 pilot watch with a German calendar. It is currently running without any issues. The exterior shows signs of wear from everyday use. The crown, mainspring, and gaskets were replaced during an overhaul in 2021. The daily rate is approximately +10 seconds when laid flat. The original leather strap in the images shows signs of wear, and there are scratches on the case back. I have checked the chronograph function, hacking function, and calendar function for this listing, and there are currently no abnormalities. Automatic watches are complex machines, and there is a possibility of failure even if they are working today, so please understand that returns and claims are not accepted. Please bid only if you understand that this is a watch from approximately 30 years ago.