Seiko Cal. 6640 - 496

The 6640-496 is a sought-after Hand-Winding piece from Seiko's golden era. With its 22mm lug width and 8.3mm profile, it sits comfortably on most wrists. [seikata-wm-d33dd46e3e30]

Also known as: Helmet, UFO

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1998

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