Seiko Cal. 6691 - 537

The Seiko 6691-537 represents an important milestone in Seiko's 1967 lineup. It features a Burgundy dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-1b03a70450df]

Also known as: Tuna, Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1967

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