Seiko Cal. 6657 - 172

Released in 1972, the Cal. 6657 with design code 172 was part of Seiko's domestic market collection. Powered by the 6657 caliber with 26j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-b7204a8e6195]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

190m

Dial Color

Champagne

Jewels

26j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1972

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