Seiko Cal. 6657 - 735

The Seiko 6657-735 represents an important milestone in Seiko's 1975 lineup. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-fec6bdf3467b]

Also known as: Bullhead, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Silver

Jewels

25j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1975

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