Seiko Cal. 6630 - 627

The 6630-627 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-c9d3cc5f8741]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

13.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1973

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