Seiko Cal. 4521 - 370

The Seiko 4521-370 represents an important milestone in Seiko's 1966 lineup. Powered by the 4521 caliber with 25j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-1843ee181047]

Also known as: Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1966

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