Seiko Cal. 6638 - 637

Seiko 6638-637

The 6638-637 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6638 caliber with 19j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-101219cbb9fb]

Also known as: Panda, Emperor

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
37mm
Case Thickness
9.0mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
140m
Dial Color
Champagne
Jewels
19j
Frequency
21,600 bph
Power Reserve
53 hours
Year
1985

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