Seiko Cal. 6631 - 165

Released in 1971, the Cal. 6631 with design code 165 was part of Seiko's domestic market collection. It features a Champagne dial protected by a Sapphire crystal and offers 90m of water resistance. [seikata-wm-9d30f8d95525]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Champagne

Jewels

19j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1971

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