Seiko Cal. 6640 - 827

The Seiko 6640-827 represents an important milestone in Seiko's 1980 lineup. Powered by the 6640 caliber with 32j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-d9b48f327190]

Also known as: Helmet, Arnie

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

45mm

Case Thickness

9.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1980

Related Models

• Seiko 6375-344
• Seiko 6372-402
• Seiko 4499-215
• Seiko 4597-929
• Seiko 6353-419
• Seiko 5223-526
• Seiko 6339-135
• Seiko 5668-650
• Seiko 6145-456
• Seiko 4545-617
• Seiko 5266-105
• Seiko 4564-966