Seiko Cal. 5690 - 371

The Seiko 5690-371 represents an important milestone in Seiko's 1990 lineup. It features a Navy dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-e7fe31e860a3]

Also known as: Helmet, Bellmatic

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1990

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