Seiko Cal. 6640 - 206

The 6640-206 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-9408b735d384]

Also known as: Samurai

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

11.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

200m

Dial Color

Black

Jewels

35j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1986

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