Seiko Cal. 6391 - 657

The 6391-657 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6391 caliber with 35j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-85bd205aa962]

Also known as: Bullhead, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Burgundy

Jewels

35j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1965

Related Models

• Seiko 6194-766
• Seiko 6268-425
• Seiko 6160-939
• Seiko 6129-943
• Seiko 0747-286
• Seiko 3820-192
• Seiko 3815-736
• Seiko 4482-592
• Seiko 5235-245
• Seiko 6639-700
• Seiko 6167-900
• Seiko 7080-627