Seiko Cal. 5640 - 855

Released in 1974, the Cal. 5640 with design code 855 was part of Seiko's domestic market collection. It features a Green dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-3c502aa9ff62]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

Green

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1974

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