Seiko Cal. 6657 - 356

The Seiko 6657-356 represents an important milestone in Seiko's 1995 lineup. It features a Navy dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-2f921a724fb4]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

35j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1995

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