Seiko Cal. 6378 - 200

The 6378-200 is a sought-after Quartz piece from Seiko's golden era. It features a Black dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-88244c38181a]

Also known as: Monster, Sumo

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Black

Jewels

34j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1970

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