Seiko Cal. 6140 - 991

The 6140-991 is a sought-after Hand-Winding piece from Seiko's golden era. With its 22mm lug width and 15.4mm profile, it sits comfortably on most wrists. [seikata-wm-036adc6423bf]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

43mm

Case Thickness

15.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1977

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