Seiko Cal. 5231 - 921

This Spring Drive model from 1965 features a 36mm Gold-Plated case. Powered by the 5231 caliber with 25j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-573a80d82fe1]

Also known as: Bellmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

15.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1965

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