Seiko Cal. 3878 - 730

The Seiko 3878-730 represents an important milestone in Seiko's 1969 lineup. Powered by the 3878 caliber with 33j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-8c9c65dc1c77]

Also known as: Sumo, UFO

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

38mm

Case Thickness

14.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1969

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