SEIKO 5 SPORTS SRPJ45K1 Skeleton Style

The SRPJ45K1 gives you a bold look into the gears that make time tick. With a translucent “Time Sonar” dial that reveals the day/date discs, a blue-toned skeleton finish and the dependable automatic motion of the Seiko 5 Sports line, it’s the kind of watch that works hard and winks at you while doing it.

Key Features

• Automatic Movement (Caliber 4R36) — self-winding with manual winding and hacking seconds.
• Approx. 41-Hour Power Reserve — wear it today, and it doesn’t stop tomorrow.
• Skeleton / Transparent Dial — you can see the day/date discs in action beneath the surface.
• Stainless Steel Case & Bracelet — strong build without pretension.
• Hardlex Crystal — Seiko’s durable mineral-type glass for everyday life.
• 100 m Water Resistance (10 bar) — ready for swimming or rain, though not a deep dive tool.
• Case Size ~42.5 mm Diameter / Thickness ~13.4 mm — prominent but wearable.
• See-Through Case Back — mechanical motion visible from beneath.

Specifications

• Model: SRPJ45K1
• Movement: Automatic, Caliber 4R36
• Jewels: 24 jewels / 21,600 vph (as per 4R36)
• Power Reserve: Approx. 41 hours
• Case Material: Stainless steel
• Bracelet / Band: Stainless steel bracelet (22 mm lug width)
• Crystal / Glass: Hardlex
• Case Diameter: ~42.5 mm
• Case Thickness: ~13.4 mm
• Lug-to-Lug: ~46 mm (approximate)
• Water Resistance: 100 m / 10 bar
• Functions: Hours, minutes, seconds; day & date display; unidirectional rotating bezel.
• Color / Dial: Blue skeleton style dial, silver stainless case/bracelet, two-tone bezel (blue/black) noted in some listings.
• Condition: New

See the movement. Feel the precision. Wear the SRPJ45K1 and let your wrist show that you appreciate both style and substance — automatic motion, visible gear-train, and confidence in every glance.