Seiko Cal. 6691 - 750

This Automatic model from 1966 features a 46mm Titanium case. Powered by the 6691 caliber with 21j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-5bdeebe82e0b]

Also known as: Crown, Baby Tuna

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

46mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

60m

Dial Color

Green

Jewels

21j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1966

Related Models

• Seiko 6237-517
• Seiko 5688-691
• Seiko 7026-564
• Seiko 3828-260
• Seiko 4552-865
• Seiko 0725-262
• Seiko 6287-940
• Seiko 4563-605
• Seiko 7020-999
• Seiko 3886-415
• Seiko 4475-603
• Seiko 6320-103