- 1889 – 1891
This photogravure reproduces a painting by American artist Daniel Ridgway Knight (1839-1924), who was born in Philadelphia, Pennsylvania and also spent time in France. The photogravure was part of a massive study of…
Cachet created by Cachet Craft depicts the Tuskegee Institute and George Washington Carver. Stamps feature a portrait of Carver.
- Artist Boll, Ken
- Creator Cachet Craft
- Subject Inventors, Science on postage stamps, African American scientists, Commemorative postage stamps, Carver, George Washington, 1864?-1943, First day covers (Philately), Postage stamps, Agricultural chemistry, Botanists, Tuskegee Institute, and Cachets (Philately)
- after 1920 – 1944
Portrait of Leo Hendrik Baekeland (1863-1944), inventor of Bakelite, the first fully synthetic plastic.
- circa 1900
Portrait of Henry Heide (1846-1931), known in his time as the dean of American candy manufacturers. A native of Germany, Heide immigrated to the United States in 1866 and ran a retail grocery store in Pittsburgh before…