Seiko Cal. 6646 - 724

The Seiko 6646-724 represents an important milestone in Seiko's 1967 lineup. It features a Silver dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-f92735ed58c3]

Also known as: Monster, Silverwave

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

39mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

21j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1967

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