Seiko Cal. 6690 - 604

The 6690-604 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6690 caliber with 29j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-2229f39d3f79]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1968

Related Models

• Seiko 3831-393
• Seiko 3894-872
• Seiko 6123-501
• Seiko 0778-898
• Seiko 7121-869
• Seiko 3816-325
• Seiko 5223-178
• Seiko 4582-573
• Seiko 3896-507
• Seiko 6146-275
• Seiko 6341-551
• Seiko 6110-573