"And it is just as special the winner is trained by Cran [Dalgety].
"He has been a huge supporter of mine, a massive part of my career and a great friend so I am glad the new mark comes on one of his horses."
The nose victory was cause for double celebration as it was also Dunn's 2000th domestic career win.
He now joins an elite club whose only other members are Tony Herlihy, Maurice McKendry, Ricky May and David Butcher.
Dunn will win the national drivers' premiership for the 10th straight season and with $2,206,866 in domestic stake earnings this season should break his own personal best of $2,220,136 by the end of the term.