Seiko Cal. 6640 - 547

The Seiko 6640-547 represents an important milestone in Seiko's 1969 lineup. It features a Cream dial protected by a Acrylic crystal and offers 180m of water resistance. [seikata-wm-19a6a1e45a97]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Cream

Jewels

35j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1969

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