Seiko Cal. 4540 - 621

The Seiko 4540-621 represents an important milestone in Seiko's 1972 lineup. Powered by the 4540 caliber with 25j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-ee09b3a0a27e]

Also known as: Turtle

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

35mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Silver

Jewels

25j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1972

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