Seiko Cal. 6638 - 648

Seiko 6638-648

Released in 1997, the Cal. 6638 with design code 648 was part of Seiko's domestic market collection. Powered by the 6638 caliber with 26j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-25a87d1843ac]

Also known as: Baby Tuna

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
43mm
Case Thickness
11.1mm
Lug Width
18mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
40m
Dial Color
White
Jewels
26j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1997

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seikata-wm-25a87d1843ac