Seiko Cal. 6639 - 498

Seiko 6639-498

The Seiko 6639-498 represents an important milestone in Seiko's 1988 lineup. Powered by the 6639 caliber with 31j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-c04a79bf911d]

Also known as: Baby Tuna

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
46mm
Case Thickness
10.3mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
180m
Dial Color
Navy
Jewels
31j
Frequency
36,000 bph
Power Reserve
38 hours
Year
1988

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