Seiko Cal. 6638 - 561

Seiko 6638-561

The Seiko 6638-561 represents an important milestone in Seiko's 1965 lineup. Powered by the 6638 caliber with 35j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-4cf6ca3af5d8]

Also known as: Sea Horse, Baby Tuna

Specifications

Movement
Solar
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
10.8mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
200m
Dial Color
White
Jewels
35j
Frequency
36,000 bph
Power Reserve
49 hours
Year
1965

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