Seiko Cal. 6657 - 321

The 6657-321 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6657 caliber with 30j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-85b92d7ca53c]

Also known as: Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

150m

Dial Color

Champagne

Jewels

30j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1985

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