Prospex SPB503J1
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Description
The Seiko Prospex Alpinist SPB503J1 is a rugged yet refined watch designed for exploration. Powered by the 6R55 automatic movement, it offers a 72‑hour power reserve and reliable accuracy. Its 39.5mm stainless steel case with super hard coating is paired with a sapphire crystal and magnifier for clear legibility, while LumiBrite hands and markers ensure visibility in any light.
Practical features like a rotating compass bezel, screw‑down crown, and 20‑bar water resistance make it ready for the outdoors, while the see‑through case back and three‑fold clasp add everyday sophistication. At 147g, it balances durability with comfort, making it a versatile companion for adventure and daily wear.
Movement
Caliber Number: 6R55
Movement Type: Automatic with manual winding
Precision: '+25 to -15 seconds per day
Power Reserve: Approx. 72 hours(3 days)
Jewels: 24
Functions: Stop second hand function
Case/Band
Case Material: Stainless steel (super hard coating)
Thickness: 12.7 mm
Diameter: 39.5 mm
Lug-to-lug: 46.4 mm
Crystal: Sapphire crystal with magnifier
Crystal Coating: Anti-reflective coating on inner surface
Clasp: Three-fold clasp with push button release
Distance between lugs: 20
Other Details
Water Resistance: 20 bar
Magnetic Resistance: 4,800 A/m
Weight: 147 g
Features: LumiBrite on hands and index(es) Rotating compass bezel Screw-down crown See-through & Screw case back
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