Seiko Cal. 6631 - 645

The 6631-645 is a sought-after Quartz piece from Seiko's golden era. It features a Burgundy dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-fec2cd2946cb]

Also known as: Navigator

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Burgundy

Jewels

19j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1973

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