Seiko Cal. 3870 - 747

The 3870-747 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3870 caliber with 18j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-a5ddec5b7fde]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1984

Related Models

• Seiko 3891-486
• Seiko 5665-258
• Seiko 5245-122
• Seiko 6259-538
• Seiko 0713-783
• Seiko 5273-555
• Seiko 0739-306
• Seiko 7192-134
• Seiko 7135-537
• Seiko 7133-969
• Seiko 6173-323
• Seiko 7112-364