Seiko Cal. 6631 - 539

The 6631-539 is a sought-after Spring Drive piece from Seiko's golden era. It features a Burgundy dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-91d90f0288e9]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Burgundy

Jewels

27j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1977

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