Seiko Cal. 6391 - 717

The 6391-717 is a sought-after Spring Drive piece from Seiko's golden era. It features a Silver dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-69b4a8b81c17]

Also known as: Monster, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Silver

Jewels

22j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1993

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