Seiko Cal. 4478 - 820

The Seiko 4478-820 represents an important milestone in Seiko's 1996 lineup. Powered by the 4478 caliber with 22j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-f0f27067b2f8]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Silver

Jewels

22j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1996

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