Seiko Cal. 3866 - 684

The 3866-684 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3866 caliber with 21j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-c5891dcc2152]

Also known as: Helmet, Rally

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

34mm

Case Thickness

15.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

90m

Dial Color

Champagne

Jewels

21j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1986

Related Models

• Seiko 7052-633
• Seiko 6652-299
• Seiko 6129-160
• Seiko 5210-276
• Seiko 6632-158
• Seiko 5275-612
• Seiko 6270-774
• Seiko 7054-243
• Seiko 5232-725
• Seiko 5247-742
• Seiko 3866-992
• Seiko 3885-306