Prospex Alpinist. Seiko Prospex challenges every limit with timepieces created to exceed expectations, engineered with superior style and innovative technology for the sea, sky or land. Inspired by Seiko’s first sports watch, introduced in 1959 for daring mountaineers, this rugged creation celebrates high-intensity timekeeping, prominently displaying the Alpinist logo on the dial. Equipped with a rotating inner compass bezel for outdoor adventure, the iconic design features a teal dial with signature Arabic numerals and wedge-shaped indices, stylized LumiBrite hands and markers. Visible through the transparent screwdown caseback, marked with the Alpinist “mountain” symbol, the 24-jewel automatic movement beats at 21,600 vibrations per hour with a power reserve of approximately 72 hours and manual winding capability. Crafted of stainless steel with super-hard coating, with tri-fold push button release clasp and secure screwdown crown. 20 Bar, 200M Water Resistant
- Model: SPB503
- Collection: Prospex
- Gender: Men's
- Dial Color: Turquoise
- Strap Material: Stainless steel
- Strap Detail: Strap
- Distance between lugs: 20 mm
- Movement: Automatic
- Caliber: 6R55
- Jewels: 24
- Power Reserve: approximately 72 hours
- Case Material: Stainless steel
- Case Diameter (mm): 39.5
- Case Thickness (mm): 12.7
- Lug to Lug (mm): 46.4
- Crystal Type: Sapphire crystal with anti-reflective coating (inner surface)
- Water Resistance: 200m
- LumiBrite: LumiBrite hands and markers
- Functions: Rotating inner compass bezel, Magnified date calendar, Screwdown crown, Transparent screwdown caseback, Tri-fold push button release clasp
- Inspired by Seiko’s first sports watch, introduced in 1959 for mountaineers
- Teal dial in a hue pulled from the archives
- Signature Arabic numerals and wedge-shaped indices
- Stylized LumiBrite hands and markers
- Alpinist logo displayed on the dial
- Rotating inner compass bezel for outdoor navigation
- Automatic movement with manual winding capability
- Magnified date calendar
- Screwdown crown
- Transparent screwdown caseback with iconic Alpinist mountain symbol
- Tri-fold push button release clasp
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