Seiko Cal. 4540 - 746

This Spring Drive model from 1977 features a 37mm Hardlex-Coated Steel case. It features a Cream dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-d0eaf92baa64]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Cream

Jewels

34j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1977

Related Models

• Seiko 7151-674
• Seiko 4470-789
• Seiko 6677-721
• Seiko 5681-495
• Seiko 6237-325
• Seiko 5635-160
• Seiko 7049-204
• Seiko 3882-294
• Seiko 4469-574
• Seiko 5223-917
• Seiko 4579-416
• Seiko 6137-757