Seiko Cal. 6657 - 100

Released in 1972, the Cal. 6657 with design code 100 was part of Seiko's domestic market collection. It features a Cream dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-0512ebd31ad2]

Also known as: Turtle, Sportsmatic

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

10.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

90m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1972

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