Seiko Cal. 3870 - 900

The Seiko 3870-900 represents an important milestone in Seiko's 1968 lineup. It features a Navy dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-dcd18a335ad7]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

10.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1968

Related Models

• Seiko 0740-223
• Seiko 6263-921
• Seiko 0724-551
• Seiko 5231-905
• Seiko 3874-589
• Seiko 6656-481
• Seiko 5628-348
• Seiko 5293-940
• Seiko 5650-694
• Seiko 6344-637
• Seiko 4489-241
• Seiko 4540-121