Seiko Cal. 6656 - 641

The Seiko 6656-641 represents an important milestone in Seiko's 1978 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 190m of water resistance. [seikata-wm-c472b4f7bd3c]

Also known as: Baby Tuna, Emperor

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

13.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1978

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