Seiko Cal. 6637 - 546

The 6637-546 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-a820bdd5a29a]

Also known as: Shogun, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

11.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1967

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