Seiko Cal. 6631 - 306

The 6631-306 is a sought-after Hand-Winding piece from Seiko's golden era. It features a Green dial protected by a Mineral crystal and offers 100m of water resistance. [seikata-wm-99195869f305]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

9.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

20j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1999

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