Seiko Cal. 6638 - 436

Seiko 6638-436

The Seiko 6638-436 represents an important milestone in Seiko's 1999 lineup. Powered by the 6638 caliber with 28j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-20f05e37435a]

Also known as: Bullhead, Bellmatic

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
34mm
Case Thickness
15.5mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
110m
Dial Color
Navy
Jewels
28j
Frequency
36,000 bph
Power Reserve
53 hours
Year
1999

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