Seiko Cal. 4539 - 640

Seiko 4539-640

The 4539-640 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4539 caliber with 24j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-5355c3fe1dca]

Also known as: Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
39mm
Case Thickness
11.8mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
150m
Dial Color
Blue Sunburst
Jewels
24j
Frequency
36,000 bph
Power Reserve
44 hours
Year
1970

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