Flag of the City of Holyoke, Massachusetts, featuring a simplified version of its municipal seal, shown in royal purple with its name emblazoned around it. Holyoke's purple and white colors seem to originate before the First World War, with a September 1914 South Holyoke Lyceum gala being hosted in a City Hall Grand Ballroom decked out with purple and white banners and clusters of so-colored lights, and it also appeared as the 1919 color scheme of Holyoke High School's yearbook.
Own work
Simtropolitan, original designer unknown