Seiko Cal. 5681 - 177

The Seiko 5681-177 represents an important milestone in Seiko's 1968 lineup. It features a Navy dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-0b0737f64b40]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1968

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