MICROSCOPE-ANTIQUES.COM © 2013-19.
HARDNESS TESTER FOR USE WITH MICROSCOPE
MAKER: SPENCER
c. 1945
DATES of PRODUCTION: 1920's to 1950's(?)
SIGNED:'MICROCHARACTER, American Optical Co, Buffalo 15, N.Y., Made in U.S.A.'
THE LATER 1940's CATALOG ENTRY: