Seiko Cal. 6397 - 635

The 6397-635 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6397 caliber with 21j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-1f3082769c18]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

13.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Green

Jewels

21j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1975

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