Seiko Cal. 6378 - 436

Released in 1986, the Cal. 6378 with design code 436 was part of Seiko's domestic market collection. Powered by the 6378 caliber with 33j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-19292bc5bd43]

Also known as: Monster, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Burgundy

Jewels

33j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1986

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