Seiko Cal. 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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