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Item#TypeModel No.Match No.Variant No.Model NameMakerCountryProduction or Serial No.MaterialScale LengthDateCondition
KEU450Linear
4101
4393
3
StadiaKeuffel & EsserUSA
170
Engine divided celluloid laminated mahogany
"20"
1913
C5

Notes: Metal framed indicator. Celluloid laminate removed from slidewell and patent notation moved to front below B scale. MADE IN U.S.A. added below B scale. Instructions on back moved to left side.

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