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Details and Image



Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU623Linear
N4080-5
4218
n/a
Log Log Duplex TrigKeuffel & EsserUSA
610426
Engine divided celluloid laminated mahogany
"20"
1951
C4

Notes: Improved glass indicator. Front and rear scale sets changed. Model name and number and all notations moved to top edge. 5 patents listed on the top edge.

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