Seiko Cal. 6378 - 646

The 6378-646 is a sought-after Spring Drive piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 200m of water resistance. [seikata-wm-55d650fbd52b]

Also known as: Golden Tuna, Arnie

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1992

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