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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU622Linear
4080-5
4220
n/a
Log Log Duplex TrigKeuffel & EsserUSA
294649
Engine divided celluloid laminated mahogany
"20"
1958
C3

Notes: "Improved glass indicator. Exposed mahagony strips on edges. Reverse scale set changed. 5 patents listed on the top edge with 2,500,480 replacing 1,930,852. "

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