Seiko Cal. 4521 - 904

The 4521-904 is a sought-after Spring Drive piece from Seiko's golden era. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-e7afeddda6ea]

Also known as: Crown, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

8.0mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Black

Jewels

29j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1972

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