Posted 5 years ago
This stereoscope was patented by Charles Pappenhagen on April 12, 1904. The patent was assigned to and manufactured by the Keystone View Company of Meadville,PA. The stereoscopic card is Mr. R.W. Sears
the founder and President of Sears, Roebuck and Co. The telephone on Mr. Sears desk is a 1904 Automatic Electric Strowger dial candlestick.