Seiko Cal. 6639 - 357

The 6639-357 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6639 caliber with 21j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-c672530df754]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

12.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

80m

Dial Color

Cream

Jewels

21j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1975

Related Models

• Seiko 6316-654
• Seiko 6177-224
• Seiko 5622-273
• Seiko 7137-642
• Seiko 5232-284
• Seiko 5645-813
• Seiko 4527-317
• Seiko 7113-589
• Seiko 6396-715
• Seiko 6335-867
• Seiko 4561-553
• Seiko 7092-480