A classis and rare, vintage Seiko 6139. Outside has been well loved, but its running smooth and keeping time, had my watch maker give it a check and he said it looked like it had been service recently, and didn't need any work currently. Appears to be the original band. It fits my wrist, I'm 6ft 185. its approx 7.5" inner diameter, but has 3 holes left to open on the slider.