I got an email from Terry Allen, and his Streamlined 88 Row Crop had a casting date of Dec 10, 1947, and it was serial 120167. I guess that clinches it, Herb was wrong in his book, and I was wrong in my article since I used his book as a reference. The serial number list in the article would still be correct, since I left that untouched from the existing lists.

Live and learn they say... I had always heard 1947, but it just goes to show, just because it is in print, doesn't make it true.