I would imagine flat horns were made , as far back as when regular shaped powder horns were made here in America. Why wouldn't they be? Post Rev. War times saw no need for the govt . to order powder horns produced for troops , so in more relaxed times , especially in the Appalachian Mtn. regions , flat horns were in vogue. Illustrator Jim Webb's books from 1990 illustrate a number of flat , oval , and other horns from the old days. There's little cut and dried info from the old days , and only the odd evidence , that some things happened. Luckily , in the early 19th century , periodicals were in circulation. Articles written from testimony's of later relatives that knew the truth of the actual events before 1800 were collected and printed for later folks to read. These articles of actual testimonies were popular inthose times. Many were written , and were later put into books for us 21st folks to study. For the amount of actual testimonies taken and printed , one fact is evident , little is noted about the mundane things , like powder horn shapes , guns , knives , etc.. These items were mentioned, but sadly, no descriptions exist...........oldwood