Seiko Cal. 6377 - 939

The 6377-939 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-d97f09eea5d9]

Also known as: Tuna, Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

21j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1988

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