Seiko Cal. 6321 - 663

The 6321-663 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6321 caliber with 35j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-da0c0d24a6b9]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

160m

Dial Color

Burgundy

Jewels

35j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1998

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