FWIW
From my archives a photo of CJ's Thomas Winch PTO insitu:
http://www.aulro.com/albums/album26/tw.sized.jpg
The words on the casting say simply "THOMAS WINCH....BRISBANE"
Interesting also is that the bolt pattern on the extension is different (the two lower bolts occur midway between the three upper) and it looks as though the extension is longer centre of input to centre of output shafts.....maybe?
