Seiko Cal. 3870 - 750

The Seiko 3870-750 represents an important milestone in Seiko's 1981 lineup. Powered by the 3870 caliber with 21j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-b1b9758f731a]

Also known as: Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

38mm

Case Thickness

8.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Champagne

Jewels

21j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1981

Related Models

• Seiko 6694-623
• Seiko 7188-604
• Seiko 5222-795
• Seiko 5622-237
• Seiko 3879-936
• Seiko 5696-962
• Seiko 5277-299
• Seiko 4529-548
• Seiko 6652-724
• Seiko 6331-584
• Seiko 7098-278
• Seiko 7079-762