Seiko Cal. 3815 - 423

The Seiko 3815-423 represents an important milestone in Seiko's 1977 lineup. Powered by the 3815 caliber with 35j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-ec46ce3bb485]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

41mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1977

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