Seiko Cal. 6657 - 321

Seiko 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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