Seiko Cal. 4436 - 691

This Hand-Winding model from 1987 features a 40mm PVD Black case. Powered by the 4436 caliber with 32j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-fe8cddc0eb9d]

Also known as: Turtle, Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

10.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1987

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