Seiko Cal. 6640 - 335

The 6640-335 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Cream dial protected by a Hardlex crystal and offers 120m of water resistance. [seikata-wm-e134fee95db3]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

18j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1971

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