Seiko Cal. 6391 - 644

The 6391-644 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6391 caliber with 35j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-001b87382960]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

130m

Dial Color

White

Jewels

35j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1996

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