Seiko Cal. 5640 - 618

The 5640-618 is a sought-after Solar piece from Seiko's golden era. Powered by the 5640 caliber with 29j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-88a5e27584da]

Also known as: Bellmatic

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Cream

Jewels

29j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1965

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