Seiko Cal. 4445 - 737

The 4445-737 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4445 caliber with 31j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-055c28547b43]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

36mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1993

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