Seiko Cal. 4437 - 356

The 4437-356 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4437 caliber with 27j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-adac435d5fa9]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

8.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1991

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