Seiko Cal. 6637 - 851

The 6637-851 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Silver dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-adc02a4a48b9]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Silver

Jewels

23j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1993

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