Seiko Cal. 6643 - 235

The Seiko 6643-235 represents an important milestone in Seiko's 1988 lineup. It features a Green dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-e9e8edc8fe01]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Green

Jewels

31j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1988

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