Seiko Cal. 5278 - 663

The Seiko 5278-663 represents an important milestone in Seiko's 1973 lineup. Powered by the 5278 caliber with 31j jewels beating at 21,600 bph, it delivers a 55 hours power reserve. [seikata-wm-a5851780d797]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

11.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

30m

Dial Color

Silver

Jewels

31j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1973

Related Models

• Seiko 3895-687
• Seiko 6320-282
• Seiko 5259-411
• Seiko 0789-751
• Seiko 7166-959
• Seiko 6148-292
• Seiko 6263-995
• Seiko 5263-719
• Seiko 6399-593
• Seiko 5694-722
• Seiko 4586-359
• Seiko 5255-107