Seiko Cal. 6399 - 907

Released in 1975, the Cal. 6399 with design code 907 was part of Seiko's domestic market collection. Powered by the 6399 caliber with 21j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-c964cf6de5cb]

Also known as: Helmet, World Timer

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Cream

Jewels

21j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1975

Related Models

• Seiko 6684-944
• Seiko 0728-597
• Seiko 6366-570
• Seiko 7097-329
• Seiko 6390-906
• Seiko 0792-544
• Seiko 4468-276
• Seiko 4455-738
• Seiko 6226-326
• Seiko 7124-936
• Seiko 5227-522
• Seiko 3831-819