Replica est. use 1950s - 1960s. Used for celebrations by the museum or was displayed on the building as an everyday marker for location. Even this late 15 star flags are rare. The reason may likely be flag education was not offered in primary and middle school as well as upper grades. It may have something to do with the Supreme Court ruling in the 1960s prohibiting mandatory "Pledge" to the U.S. Flag. The prohibition only covered the pledge itself and not general education of the flag's history which is rich. Possibly an impression set in that teaching history of the flag was stigmatized by that ruling and the schools found it easier to avoid the controversy and much deeper than the story of the first flag and the story of Betsy Ross fraught with misinformation for the past 130 years in the schools. It is not a history that can be easily distilled down to a simple story suggesting a style to General George Washington and we have our flag today. The number of different styles and star patterns are alone a number that boggles the mind which is best estimated to be in the hundreds if not the thousands examples. ZFC gives a glimpse into that rich subject that flag education has application to all the Social Sciences not to mention the History of Textiles and the advent of the Industrial Revolution in the early part of the 19th century in America. It has a foundation in advanced mathmatics with its geometric complexities in flag design plus the visual arts.