Experience the peak of 1970s Japanese watchmaking with this 100% all-original Seiko 6139-7080. Featuring its iconic hexagonal 'Hexagon' case, this 1973 automatic chronograph has been masterfully restored to meet modern performance standards. With a chronometer-level accuracy of 0-5 seconds per day, it is a definitive collector's piece that combines historical significance with daily reliability. Year of Manufacture: Crafted in 1973. Model Reference: 6139-7080 (The Hexagon). Movement: Authentic Seiko 6139 Automatic Chronograph. One of the first and most reliable automatic chronograph movements ever made. Chronograph Performance: Start, stop, and reset functions work flawlessly. The second hand resets perfectly to 12 o'clock. Condition: Fully restored and professionally serviced. In perfect working order and ready for daily wear. Accuracy: Keeping time perfectly and ready for daily wear. (Daily deviation: ±30 seconds). Calendar: Day-Date quick-set mechanisms are fully operational and work perfectly. Wrist Size: Fits up to a 21 cm (8.6 inches) wrist. Authenticity: 100% Full Original. Every part of this watch, from the dial to the movement, is authentic and original to the piece. Water Resistance: Vintage timepiece; water resistance not tested. Please keep away from water to ensure longevity. Diametr: 40 mm Without Crow Cargo : 2-6 Business day Wordwide ( fedex )