Seiko Cal. 6641 - 394

The Seiko 6641-394 represents an important milestone in Seiko's 1967 lineup. It features a Black dial protected by a Acrylic crystal and offers 170m of water resistance. [seikata-wm-3776e5d864c3]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

15.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1967

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