While Dr. Thomas' Eclectric Oil was marketed until the 1940s and 1950s, the particular trade card in this collection most likely dates to the late Victorian era. The Victorian era is a period of time that directly corresponds with the reign of the English Queen Victoria (1837-1901). The Victorian era saw the development of socialism, Marxism, Darwinism, and scientific Agnosticism. This period was a time of challenging known "truths." The Victorian era was also a time of snake oil peddlers–a phenomenon that lasted in one form or another through the mid-20th century. These medicines were marketed as a cure to almost any ailment, ranging from coughs and colds to deafness and lameness. While many medicines were snake oil products, some were marketed under a different label, such as "liniment," "tonic," and "compound."