Seiko Cal. 6391 - 109

The 6391-109 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6391 caliber with 35j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-c1b4705329da]

Also known as: Monster, Sumo

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Burgundy

Jewels

35j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1971

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