Seiko Cal. 3860 - 640

Seiko 3860-640

Released in 1998, the Cal. 3860 with design code 640 was part of Seiko's domestic market collection. Powered by the 3860 caliber with 34j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-9f4a686fb0c1]

Also known as: Tuna, Silverwave

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
39mm
Case Thickness
15.1mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
34j
Frequency
28,800 bph
Power Reserve
67 hours
Year
1998

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