VERY FINE. A VERY EARLY EXAMPLE OF WHAT CAN RIGHTLY BE CALLED AN ILLUSTRATED ADVERTISING DESIGN ON A 10-CENT 1847 ISSUE COVER.
Powers & Weightman, who employed the writer of this letter and used the Valerian plant in its chemical compounds, was founded by William Weightman (1813-1904). Weightman was a prominent chemical manufacturer and one of the largest landowners in the United States during the mid-1800's. He was nicknamed the "Quinine King" and invented a synthetic form of the drug. The company merged in the 1920's with the pharmaceutical giant Merck & Co.
USPCS census no. 11820. Accompanied by a transcription of the letter. With 1990 P.S.E. certificate