Seiko Cal. 3870 - 663

Seiko 3870-663

The 3870-663 is a sought-after Automatic piece from Seiko's golden era. It features a Silver dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-880e51fbbee2]

Also known as: Tuna, Flighty

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
34mm
Case Thickness
9.3mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
120m
Dial Color
Silver
Jewels
31j
Frequency
21,600 bph
Power Reserve
55 hours
Year
1976

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