Seiko Astron GPS Solar SAST023 Citizen Eco-Drive Proximity BZ1028-04E known to enthusiasts as the

known to enthusiasts as the Seiko SKX series

so you'll never need to open your caseback making sure your watch maintains it factory sealed and water resistant

During the EVA

Caliber: BALL RR1102-CSL

Seiko Astron GPS Solar SAST023 Citizen Eco-Drive Proximity BZ1028-04E known to enthusiasts as theCaliber: 7X52 Radio: GPS controlled time and time zone adjustment Accuracy: + 15 seconds per month Case Material: Stainless Steel with ceramic bezel Case Diameter: 47. 0 mm Case Thickness: 16. 5 mm Band: Stainless Steel with three fold clasp with push button release Glass: Sapphire crystal with Super Clear Coating Water Resistance: 10 bar Magnetic Resistance: 4,800 A m Functions Hour, minute and second hands Date calendar Perpetual calendar correct to