Seiko Cal. 6645 - 730

The 6645-730 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6645 caliber with 31j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-1597c95abf1b]

Also known as: Samurai, Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1974

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