Seiko Cal. 6643 - 901

The Seiko 6643-901 represents an important milestone in Seiko's 1987 lineup. It features a Green dial protected by a Mineral crystal and offers 120m of water resistance. [seikata-wm-0792d022dcaf]

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

13.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1987

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