Seiko Cal. 3878 - 506

This Hand-Winding model from 1981 features a 46mm Hardlex-Coated Steel case. It features a Black dial protected by a Acrylic crystal and offers 200m of water resistance. [seikata-wm-3047d4568d7d]

Also known as: Sumo, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Black

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1981

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