Thank you for viewing. This is an Omega men's wristwatch, the "Seamaster Military." It is estimated to have been manufactured around 1963. The movement is a "30mm caliber," a highly durable and easily maintained mechanism. Well-preserved examples are rarely seen on the market. The dial is a matte black dial reminiscent of the Ranchero and Railmaster. For this listing, the watch was overhauled and the exterior was carefully polished by a watchmaker acquaintance in September 2025, so it is very clean. Ref: 135.006-63 Cal: 286 (Manual winding) 30mm caliber * Please note that this is an antique watch and is not water-resistant. Accuracy is approximately ±2-3 seconds per day. * This is a measured value; actual measurements may vary depending on the position and environmental conditions (temperature, humidity, etc.). Please use this as a reference only. Crystal: Acrylic crystal (with Ω watermark) Buckle: New aftermarket (silver) Crown: Omega original crown (silver) Strap: New aftermarket leather strap (black) Size: H43.5 x W35.5 mm (37.9 mm including the crown) D11.2 mm Lug width: 18 mm The strap size is currently about 17.0-22.0 cm. I personally think the condition is good, but individual perceptions may vary, so please check the photos carefully and refrain from purchasing if you have any concerns. <Important> * Please read the profile before purchasing. * Although the condition is good, it is an old used item, so please understand this. * In the unlikely event that it is a fake, we will provide a refund if proof of the forgery is provided. (However, this is a watch that is several decades old, and we cannot guarantee that all the parts of the watch are original from that time. We will delete and block any questions.) * Photos are basically taken with a smartphone. We try to represent the item as accurately as possible, but it may look cleaner than the actual item, or conversely, the actual item may look cleaner (in my opinion, this is more often the case). * Even if there are defects in the description or title, the current condition takes precedence. I apologize for any inconvenience, but please consider purchasing after understanding that this is a used watch.