Seiko Cal. 6391 - 257

The 6391-257 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-60e7b980a3c6]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

23j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1983

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