Seiko Cal. 6642 - 903

The 6642-903 is a sought-after Spring Drive piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-d0673cea3948]

Also known as: Tuna, Rally

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1992

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