Signedface, center left: KEUFFEL & ESSER Co / N.Y.
Inscribedface, center: PARAGON / U.S. ST'D / 1415P R;
face, center right: [griffin logo] / TRADEMARK;
back, center top: 50
FunctionFor measuring distances and/or transferring distances at a fixed ratio, on engineering blueprints.
Primary Sources"Engineers', Chain Scales" Catalogue of Keuffel & Esser Co. 42, vol. 1 (1955): 182.
ProvenancePrivate Donor, Troy, New York.