Seiko Cal. 3870 - 664

The 3870-664 is a sought-after Solar piece from Seiko's golden era. Powered by the 3870 caliber with 30j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-efe75e2d1999]

Also known as: Helmet, Crown

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

8.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Champagne

Jewels

30j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1972

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