Seiko Cal. 7021 - 312

The 7021-312 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7021 caliber with 23j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-1c82940724fb]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

23j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1986

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