Seiko Cal. 6657 - 617

Released in 1969, the Cal. 6657 with design code 617 was part of Seiko's domestic market collection. It features a Navy dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-9db28eb4103b]

Also known as: Turtle, UFO

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

36mm

Case Thickness

9.4mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Navy

Jewels

34j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1969

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