Vintage Seiko Chronograph Automatic 6139-6002 blue pogue with original hard to find users manual. I am the original owner of this watch. My father purchased this watch for me in late 1973 or early 1974 while stationed at Tachikawa Air Force Base, Japan. The watch was last serviced in the late 1980s and has been sitting in my safe since the early 1990s. All in all, I probably used this as my daily wear for about seven years. As far as I remember, only the crystal and the watch band have been replaced. Everything functions but accuracy is not guaranteed as with any watch of this age, it will need to be cleaned and fully serviced if wanting to use it as a daily watch. There are light scratches on the surface of the watch and the buttons are sticking. See photos for details of the watch. The serial number is 395576 which means it was manufactured in October 1973.