Seiko Cal. 6661 - 378

This Hand-Winding model from 1965 features a 42mm Gold-Plated case. Powered by the 6661 caliber with 33j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-818902ec0fc8]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

11.0mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Champagne

Jewels

33j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1965

Related Models

• Seiko 3878-319
• Seiko 7093-335
• Seiko 5276-463
• Seiko 7153-445
• Seiko 6649-812
• Seiko 6661-724
• Seiko 0769-694
• Seiko 3863-392
• Seiko 6177-858
• Seiko 5697-181
• Seiko 5272-217
• Seiko 0713-668