Seiko Cal. 6391 - 201

The Seiko 6391-201 represents an important milestone in Seiko's 1976 lineup. It features a Navy dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-614579b3eec3]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1976

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