Seiko Cal. 6640 - 842

Released in 1982, the Cal. 6640 with design code 842 was part of Seiko's domestic market collection. It features a Silver dial protected by a Hardlex crystal and offers 130m of water resistance. [seikata-wm-7b0c0beb7b3e]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

15.4mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Silver

Jewels

21j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1982

Related Models

• Seiko 5690-793
• Seiko 6389-496
• Seiko 5695-188
• Seiko 6184-336
• Seiko 7017-392
• Seiko 4510-754
• Seiko 5656-146
• Seiko 6652-361
• Seiko 0712-556
• Seiko 6162-579
• Seiko 4526-312
• Seiko 6280-659