Seiko Cal. 6645 - 722

This Spring Drive model from 1996 features a 40mm PVD Black case. It features a Navy dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-e15e3e996d37]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Navy

Jewels

22j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1996

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