Seiko Cal. 0720 - 397

The 0720-397 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Hardlex crystal and offers 120m of water resistance. [seikata-wm-245f433732d9]

Also known as: Sumo, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1983

Related Models

• Seiko 4491-860
• Seiko 6280-301
• Seiko 3813-208
• Seiko 7187-939
• Seiko 5660-526
• Seiko 6197-180
• Seiko 3886-325
• Seiko 7062-593
• Seiko 6690-720
• Seiko 7190-626
• Seiko 3814-143
• Seiko 0728-292