Prospex Alpinist SPB503 77 Comfortable to wear

Comfortable to wear

graphic heart rate zone indication

Framed by a blue tachymeter outer ring

changing hue moment by moment depending on the light

Prospex Alpinist SPB503 77 Comfortable to wearProspex 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. Driven by a heritage of iconic design, Prospex continues to keep going forward with excellence in precision timekeeping, crafted for the modern world. Inspired by Seikos first sports watch, introduced in 1959 for daring mountaineers, this tailored, yet rugged creation