(84) Original Issues of The Keystone (1900-1914) Trade Publication - "The Keystone - The Organ of The Jewelry & Optical Trades" - Issues Dated: Sept, Oct, Dec, 1900 - All Twelve Months of 1901 - Feb, Apr, Aug, Oct, Dec, 1902 - All Months Except Sept & Dec, 1903 - May, June, July, Aug, 1904 - Jan, Feb, Apr, May, June, July, Aug, Sept, 1906 - Feb, June, Aug, Sept, Nov, 1907 - Jan, Feb, Apr, May, 1908 - May, Aug, Oct, 1909 - Jan, Feb, Apr, June, July, Oct, 1910 - Jan & June, 1911 - Sept 1, 1912 - Mar 15, May 1 & 15, July 15, Aug 15, Sept 1, Nov 1 & 15, Dec 15, 1913 - Jan 15, Feb 1 & 15, Mar 1, Apr 15, 1914 - These Journals Feature News Stories About The Jewelry and Optical Trades Plus Many Ads From A Variety of Companies in Those Fields, Including A Number of Illustrated Ads by C.F. Monroe Company