Seiko Cal. 6391 - 637

Seiko 6391-637

The 6391-637 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6391 caliber with 30j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-96f672fb35be]

Also known as: Navigator

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
45mm
Case Thickness
8.6mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
50m
Dial Color
Green
Jewels
30j
Frequency
36,000 bph
Power Reserve
36 hours
Year
1982

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