Seiko Cal. 6645 - 637

The 6645-637 is a sought-after Hand-Winding piece from Seiko's golden era. With its 22mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-05de168ff830]

Also known as: Helmet, Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Silver

Jewels

22j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1994

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