This is the first model of the Longines Chronograph 13zn. I acquired this model some time ago when I was looking for a cal. 13zn. I was drawn to its beautiful dial. I am listing it here in case anyone is looking for one. Based on the serial number, it is from 1937. The dial and movement are original, and it was reportedly overhauled in 2015. However, since it is quite old, parts other than the original may have been used. But I am personally satisfied with the contents of the photos. (Please check the photos for the serial number matching on the back cover and movement.) Currently, it works without any problems, including the chronograph function, but it has been 9 years since the overhaul, so it is uncertain when it may malfunction. Please refrain from purchasing if you are looking for a perfect item. While many 2-push 13zn chronographs are available, the one-push model is quite rare. Please consider this if you are looking for one. To prevent any problems, please be sure to ask any questions or concerns before the transaction. Returns are not accepted. The items included are the watch itself and the strap. A watch storage case is not included. Please be aware of this. Shipping will be via Rakuraku Mercari Delivery, which is covered by the Mercari full compensation support program, instead of standard registered mail (with shipping insurance). (Size, approximate) Diameter 34mm (excluding the crown), Thickness 13mm (Bracelet) Gray crocodile belt 19mm Buckle: Longines