39.9631644, -75.2497659 (approximate coordinates where this original marker is belived to have been)
West Chester - 20
Named From Millbourne Mills Built in 1757
Believed long gone and known only from the news article.
Image from a ‘Philadelphia Inquirer’ article. The caption claims the original date (1907) on the marker should in fact read 1909.
PA Route 3 (Market Street near Park Avenue)