Seiko Cal. 4428 - 507

The 4428-507 is a sought-after Solar piece from Seiko's golden era. Powered by the 4428 caliber with 35j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-a7b2a1888d57]

Also known as: Sumo, Crown

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

38mm

Case Thickness

15.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Burgundy

Jewels

35j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1977

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