Signedstamped on envelope: EDMUND SALVAGE COMPANY / OAKLYN-AUDUBON, NEW JERSEY
Inscribedstamped on envelope: TWO LENSES COMBINE / TO MAKE AN ACHROMAT / DIAMETER 48 MILLIMETERS / FOCAL LENGTH 11 INCHES
in pencil on envelope: 6309
ProvenanceFrom the office of Prof. Lawrence Bogorad, Dept. of Molecular & Cellular Biology, Bio Labs 5100 by Sara Schechner, Spring 2004.