Seiko Cal. 5644 - 161

This Solar model from 1980 features a 35mm PVD Black case. Powered by the 5644 caliber with 20j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-0ed508052b3e]

Also known as: Tuna, Crown

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

35mm

Case Thickness

8.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1980

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