Seiko Cal. 6398 - 645

The 6398-645 is a sought-after Quartz piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-a01e25454b4c]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

45mm

Case Thickness

11.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Black

Jewels

19j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1992

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