Seiko Cal. 6687 - 597

Seiko 6687-597

The 6687-597 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6687 caliber with 26j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-e6be87ee4edc]

Also known as: Bullhead, Bellmatic

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
41mm
Case Thickness
8.6mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
50m
Dial Color
Burgundy
Jewels
26j
Frequency
21,600 bph
Power Reserve
38 hours
Year
1973

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