Seiko Cal. 6638 - 316

Seiko 6638-316

Released in 1985, the Cal. 6638 with design code 316 was part of Seiko's domestic market collection. Powered by the 6638 caliber with 33j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-00a07f48a7b2]

Also known as: Tuna, Baby Tuna

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
39mm
Case Thickness
9.8mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
120m
Dial Color
Green
Jewels
33j
Frequency
21,600 bph
Power Reserve
43 hours
Year
1985

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