Seiko Cal. 6643 - 355

The Seiko 6643-355 represents an important milestone in Seiko's 1989 lineup. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-bf94653e382f]

Also known as: Panda

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Silver

Jewels

28j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1989

Related Models

• Seiko 5230-920
• Seiko 6152-155
• Seiko 6632-338
• Seiko 5661-864
• Seiko 6181-260
• Seiko 3835-139
• Seiko 6279-540
• Seiko 6612-352
• Seiko 7059-972
• Seiko 7148-446
• Seiko 6358-743
• Seiko 5668-574