Seiko Cal. 4521 - 713

The 4521-713 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-0c1bc90a24d3]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

12.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Silver

Jewels

18j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1966

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