Seiko Cal. 6178 - 421

The Seiko 6178-421 represents an important milestone in Seiko's 1966 lineup. It features a Silver dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-86c7853a699e]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

11.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Silver

Jewels

18j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1966

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