Seiko Cal. 6356 - 623

This Spring Drive model from 1990 features a 46mm PVD Black case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-eb7cf6379888]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

12.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1990

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