A number of historical posters were developed for the denomination’s 250th anniversary in 2017. They are available below. The high-resolution PDFs can be taken to places like FedEx/Kinkos or FastSigns for quality printing on posterboard. Or, for a really nice look, get them printed on canvas (the website easycanvasprints.com does good work for a decent price). They are grouped below according to size–12×18, 18×24, and 24×36.
Click on a thumbnail to view a much larger version