The first, Prospex SPB077 is in stainless steel with a black bezel, black dial, and steel bracelet with a super hard coating designed to resist scratches. The second, Prospex SPB079 is in stainless steel with a blue bezel and a black rubber accordion strap.
The watch measures 44 mm x 13.1 mm and has a screw-down crown (located at 4 o’clock like with the Seiko Turtle), a screw case back, and is water-resistant to 200 meters.
Both versions are powered by Seiko automatic caliber 6R15 which beats at 3Hz (21,600 vph), has 23 jewels, and has a 50-hours power reserve.
Retail is $850 (SPB079) and $1,050 (SPB077).
Learn more at Seiko.