Seiko Cal. 6391 - 436

Seiko 6391-436

The 6391-436 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6391 caliber with 21j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-7cf704a006cd]

Also known as: Turtle, Bullhead

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
45mm
Case Thickness
13.7mm
Lug Width
19mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
40m
Dial Color
Champagne
Jewels
21j
Frequency
36,000 bph
Power Reserve
70 hours
Year
1992

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