Seiko Cal. 6687 - 643

Released in 1970, the Cal. 6687 with design code 643 was part of Seiko's domestic market collection. It features a Blue Sunburst dial protected by a Mineral crystal and offers 50m of water resistance. [seikata-wm-50ea99758cda]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1970

Related Models

• Seiko 3851-333
• Seiko 4413-248
• Seiko 6293-425
• Seiko 6177-767
• Seiko 0790-104
• Seiko 7020-531
• Seiko 4414-562
• Seiko 0733-592
• Seiko 7011-510
• Seiko 6334-773
• Seiko 6189-473
• Seiko 3820-675