Seiko Cal. 6690 - 137

Seiko 6690-137

The 6690-137 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6690 caliber with 22j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-4c98b656de6e]

Also known as: Tuna, Baby Tuna

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
42mm
Case Thickness
12.9mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
140m
Dial Color
Cream
Jewels
22j
Frequency
28,800 bph
Power Reserve
40 hours
Year
1966

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