Seiko Cal. 5639 - 521

The 5639-521 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5639 caliber with 36j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-c76b78ba4854]

Also known as: Helmet, Flighty

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

42mm

Case Thickness

13.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1984

Related Models

• Seiko 0717-333
• Seiko 5272-742
• Seiko 7032-271
• Seiko 4579-216
• Seiko 7156-416
• Seiko 6616-750
• Seiko 4575-182
• Seiko 6311-424
• Seiko 6286-557
• Seiko 6239-164
• Seiko 0721-525
• Seiko 5285-320