Seiko Cal. 6391 - 978

The 6391-978 is a sought-after Automatic piece from Seiko's golden era. It features a White dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-a0afb9495dd8]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

White

Jewels

17j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1991

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