Seiko Cal. 5637 - 461

The Seiko 5637-461 represents an important milestone in Seiko's 1971 lineup. It features a Green dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-08e0e65d376d]

Also known as: Tuna, Crown

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

11.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1971

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