David,
For a number of years I believed Old Orchard was Tillinghast based on largely circumstantial evidence.
I learned a year or so ago that the course was actually designed by the pro at Plainfield at the time, Martin O'Laughlin, who did a number of NJ courses during the late 20s, early 30s, and who is generally credited with the implementation (design?) of the three replacement holes (13, 14, 15) at Plainfield around 1930, as well.