Seiko Cal. 5684 - 421

Released in 1974, the Cal. 5684 with design code 421 was part of Seiko's domestic market collection. Powered by the 5684 caliber with 21j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-cfb8de4a0807]

Also known as: Tuna, Bellmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

41mm

Case Thickness

10.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1974

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