Seiko Cal. 5660 - 326

The Seiko 5660-326 represents an important milestone in Seiko's 1978 lineup. It features a Silver dial protected by a Hardlex crystal and offers 70m of water resistance. [seikata-wm-c18a4b51278c]

Also known as: Sumo, Arnie

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

34mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

Silver

Jewels

34j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1978

Related Models

• Seiko 6635-904
• Seiko 7099-669
• Seiko 4432-282
• Seiko 3828-781
• Seiko 0771-702
• Seiko 6351-414
• Seiko 6689-966
• Seiko 6324-490
• Seiko 3898-377
• Seiko 6181-365
• Seiko 7141-981
• Seiko 6130-350