Seiko Cal. 3877 - 638

The 3877-638 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-7ad096eb6bc2]

Also known as: Bullhead, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

9.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

110m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1980

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