Seiko Cal. 4521 - 492

This Spring Drive model from 1965 features a 37mm Stainless Steel case. Powered by the 4521 caliber with 35j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-b1d695a2ef0b]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Navy

Jewels

35j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1965

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