Being new to Parkers and the history of American doubles I had never seen these old Western Field articles. Kevin, I look forward to whatever you or others may publish on Mr. Hedderly's series of articles. In his "The Small-Bore Shotgun XIV" article I did see one tidbit that I found interesting. When describing the Parker 28ga DH with 32" barrels he ordered he said this.
"The extreme length of the barrels, thirty-two inches, required a special importation of tubes of that length from abroad, and protracted the job of manufacture to a matter of six months."
I suppose for at least some gauges Parker did not stock long tubes.
Anyway, here is a picture from the same article that may be Mr. Hedderly himself with his long barreled 28ga DH.
28ga.jpg