Seiko Cal. 6688 - 537

The 6688-537 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6688 caliber with 17j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-634abdc925db]

Also known as: Helmet, Navigator

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

17j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1999

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