Seiko Cal. 4540 - 881

The Seiko 4540-881 represents an important milestone in Seiko's 1975 lineup. Powered by the 4540 caliber with 17j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-903ece73b088]

Also known as: Tuna, Bellmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

9.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1975

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