Seiko Cal. 6640 - 946

The 6640-946 is a sought-after Spring Drive piece from Seiko's golden era. It features a White dial protected by a Mineral crystal and offers 120m of water resistance. [seikata-wm-4e7788aede1b]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

11.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

White

Jewels

30j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1990

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