Seiko Cal. 6655 - 840

The Seiko 6655-840 represents an important milestone in Seiko's 1975 lineup. It features a Black dial protected by a Mineral crystal and offers 140m of water resistance. [seikata-wm-836013a7297e]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Black

Jewels

17j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1975

Related Models

• Seiko 6150-396
• Seiko 6345-565
• Seiko 6253-353
• Seiko 6164-877
• Seiko 0731-760
• Seiko 7040-517
• Seiko 6315-700
• Seiko 0722-620
• Seiko 7172-765
• Seiko 4530-411
• Seiko 5224-351
• Seiko 0775-681