Seiko Cal. 3878 - 991

The 3878-991 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 60m of water resistance. [seikata-wm-51d4e0b9aa0b]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1968

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