Seiko Cal. 4539 - 723

The Seiko 4539-723 represents an important milestone in Seiko's 1981 lineup. Powered by the 4539 caliber with 23j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-14eb805554a0]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

190m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1981

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