Seiko Cal. 5640 - 370

The 5640-370 is a sought-after Solar piece from Seiko's golden era. Powered by the 5640 caliber with 35j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-5a41092d8156]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Cream

Jewels

35j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1994

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