Seiko Cal. 6640 - 936

The 6640-936 is a sought-after Hand-Winding piece from Seiko's golden era. With its 20mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-565ebc76de1a]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

11.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

31j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1996

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