Seiko Cal. 4521 - 428

The Seiko 4521-428 represents an important milestone in Seiko's 1982 lineup. Powered by the 4521 caliber with 35j jewels beating at 36,000 bph, it delivers a 50 hours power reserve. [seikata-wm-4379e21ecb01]

Also known as: Bellmatic, Crown

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

35j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1982

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