The SPB117 is Seiko's modern Alpinist: a stainless steel field watch with an inner rotating compass bezel, a black dial with LumiBrite hands and markers, and a magnified date at 3 o'clock. Its 6R35 automatic movement runs at 21,600 vph with about 70 hours of power reserve and can be wound by hand or by the rotor. Sapphire crystal with inner anti-reflective coating, a screwdown crown and 200 m water resistance make it a genuine outdoor tool, while the see-through caseback and green-accented dial keep it wearable in town. Against cheaper field watches it adds the compass bezel and long reserve; against Swiss rivals it trades brand prestige for specs per dollar. Owners praise the dial, lume and reserve and note the compass bezel is a navigation aid, not a precision instrument.
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Owners treat the SPB117 as a well-rounded field watch: they like the dial, the lume and the long reserve, and accept the compass bezel as a simple navigation aid. Complaints center on movement accuracy out of the box and the busy dial.
The Seiko Prospex 'Alpinist' SPB117 is an automatic watch from the Prospex Collection. It is a modern re-imagining of Seiko's first sport watch, introduced in 1959, and an upgrade of a Spring 2019 limited edition.
The dial is black, with LumiBrite hands and markers and a magnified date window. A rotating inner compass bezel is built in for outdoor use. The sapphire crystal has an anti-reflective coating on the inner surface.
The case is stainless steel with a screwdown crown and a see-through caseback. The watch closes with a tri-fold push button release clasp. Its 24-jewel automatic movement can be wound manually or automatically.
