That 6138 is exceptionally nice. Most of the ones I've owned have been beat to hell or suffer from fading on the dial/hands.
7017-6050 SpeedTimer - "Rally Meter", or "Eyeless Rally" or something..lose track of these nicknames..
Vintage Seiko dive straps The GL-831 strap came on the Seiko 6306/6309 Turtle diver, the H558 “Arnie” ani-digi diver, and even some references of the famed 7c43 and 7548 quartz divers (among others). These watches were rugged, a professional divers CHEAP alternative for everyday use instead of his priced Rolex Sub, and meant to be used in salt water, which is likely why most of the surviving original straps are prone to deterioration.
I remember when I first bought my first automatic watch (Seiko Presage) and thought that the divers were kinda ugly; crazy how far I have come since then LOL