 In 1928, the road between PA 23 in Blue Ball and Reading was designated as the westernmost part of PA 73, which continued through Reading northeast to Oley and southeast to Philadelphia.At this time, a portion of the road south of Reading was paved while the remainder south to Blue Ball was unpaved.By 1930, PA 73 was paved in the Bowmansville area and from south of Reading to south of Angelica; the remainder of the route between Blue Ball and Reading was under construction at this time.