Seiko Cal. 6657 - 763

The Seiko 6657-763 represents an important milestone in Seiko's 1980 lineup. It features a Navy dial protected by a Mineral crystal and offers 110m of water resistance. [seikata-wm-6b2106aa41e8]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Navy

Jewels

24j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1980

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