Although it is not related to the Turkish philately, this envelope is very interesting. The cover which was mailed as local post in Chicago on October 13, 1881, contains an advertisement for Ottoman Cahvey Company.
Founded in Chicago in 1875, the Ottoman Cahvey Company sold wholesale coffee, tea, spices, baking powder and plant extracts. In the following years, the company changed name after it was sold. Below you can see a notice found in a newspaper dated June 7, 1884.