Seiko Cal. 6310 - 644

Seiko 6310-644

The 6310-644 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6310 caliber with 18j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-93f4b2a75e1a]

Also known as: Shogun, UFO

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
46mm
Case Thickness
12.7mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
70m
Dial Color
White
Jewels
18j
Frequency
21,600 bph
Power Reserve
64 hours
Year
1975

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