Seiko Cal. 3870 - 245

The 3870-245 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3870 caliber with 17j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-9ee4942456fc]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1970

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