FOR PARTS/REPAIR – Although the movement runs strong over an approximate 37 hour power reserve period when the watch is lying flat, when it is held at various angles the movement tends to stop. Additionally the screwdown crown is finicky, making it a bit of a challenge to set the time and to wind it up. Lastly, the sweep seconds hand resets a smidge to the right of the restart position. Given these issues and considering that the movement likely hasn’t been serviced in several decades a complete overhaul is required. This seldom seen 1960’s Rotary two register divers chronograph has a matte black “SWISS” only signed dial with white subdials that is in near pristine condition. The lume on the dial and hands, which remains fully intact and emits a quick burst glow after being exposed to bright light, has aged gracefully to a toasted golden buttermilk hue. The black bezel, which shows wear and rotates smoothly bidirectionally, presents nicely. The heavy duty all stainless steel case shows honest wear with minor signs of oxidation. The outer edge of the case back is stamped TESTED TO 20 ATM. With a diver in the center. The crystal ring shows oxidation which can likely be wire-brushed away during a service. As most clearly seen in picture 9 the bottom pusher is dinged and peeled. The crystal shows chipping and scratching. The 17 jewels Landeron 149 manual wind movement is exceptionally clean, keeps relatively accurate time when lying flat and all chronograph functions work as they should with no gumminess to the pushers. When the watch is lying crown and non-crown side up/down at approximately 90 degrees the movement tends to stop. Once the watch is moved to a more flat surface and after some gentle shaking the movement fires back up. The top pusher starts and stops the sweep seconds hand while the bottom pusher resets it along with the minute register (right subdial) back to a smidge right of the restart position. After recently winding the sharply threaded screwdown crown 25 full revolutions the movement had a healthy power reserve of approximately 37 hours. However, the crown is finicky. When it is unscrewed and pulled out to the last position gentle outward pressure needs to be applied to the crown at the same time it is being turned in order to set the time. And in order to wind the crown it needs to be pushed back in after setting the time, wound counterclockwise and then gently pulled back out to the first position to engage the winding mechanism. It takes patience and some trial and error to get the feel down but w. Hen the winding mechanism is engaged the crown winds smoothly. Iven the issues mentioned and considering that this watch is more than 50 years old with an unknown service history (there are two watchmaker service markings on the inside of the case back suggesting that the last service was done several decades ago) a complete overhaul is required. This watch measures approximately 42 mm excluding the crown, approximately 45.5 mm including the crown and approximately 20.5 mm between the lugs. Case thickness, measured from the bottom of the case back to the top of the bezel, is approximately 11.5 mm. Including the crystal case thickness measures approximately 14 mm. This watch comes on a N S A SWISS MADE STEEL INOX Pat. 434845 stamped all stainless steel bracelet showing moderate wear. I’d guestimate that it may accommodate up to an approximate 7.5 inch wrist. Given the issues mentioned and considering that the movement has likely not been serviced for several decades a complete overhaul is required. As such there are no warranties, express or implied, attached with the sale of this watch. Vintage means old and while my personal belief is that old-school means better quality and workmanship, things can and do go wrong from time to time. For this watch that time is now. Any servicing costs going forward are your responsibility. And please study the 12 high magnification pictures carefully as they are part of the description and serve as an accurate representation of the condition of this watch.