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The SPB503 is a mechanical Alpinist field watch with an ice-blue dial, a 39.5mm stainless steel case and Seiko's 6R55 automatic movement. It runs about 72 hours on a full wind, is rated to 20 bar for water resistance, and uses a sapphire crystal with an inner anti-reflective coating. The 46.4mm lug-to-lug and 12.7mm thickness keep it wearable on most wrists, and the compass-style inner bezel and LumiBrite hands and indexes mark it as a go-anywhere outdoor watch. Against other Alpinist models it stands out for the long power reserve and the dial color; against pricier Swiss field watches it gives up some finishing and accuracy tolerance.
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Owners rate the SPB503 highly, praising the ice-blue dial, the long power reserve and the solid feel of the case and bracelet. Complaints center on timekeeping spread and the watch's thickness and weight.
The Seiko Prospex SPB503 Alpinist is an automatic mechanical watch with an ice blue dial. It is powered by the Seiko 6R55 calibre, which has 24 jewels and a power reserve of about 72 hours (3 days). Accuracy is +25 to -15 seconds per day. The movement has a stop second hand function.
The case is stainless steel with a super hard coating. It has a screw-down crown, a screw-in see-through case back and a rotating compass bezel. The sapphire crystal has a magnifier and an anti-reflective coating on the inner surface. LumiBrite is applied to the hands and indexes. The watch is water resistant to 20 bar and magnetic resistant to 4,800 A/m. A three-fold clasp with push button release secures it on the wrist.
