Seiko Cal. 6637 - 252

The 6637-252 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-763ed2346590]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1967

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