Seiko Cal. 5646 - 378

The Seiko 5646-378 represents an important milestone in Seiko's 1980 lineup. It features a Black dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-6a02c387eaaa]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1980

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