Even though I was very familiar with Hoods and my father had one I always knew what I think is the yacht you are talking about as a Halvorsen 25. Certainly not a Hood 25 or a Halvorsen Hood 25. That is not to say Hood did not have a hand in the design. Never was a boat known by that name to my knowledge.
I did notice there was one in Crystal Bay at the bottom of Pittwater opposite the Pittwater Aquatic Club in recent years although if you have just purchased one perhaps it was that one.
A quick Google also shows this listing of a blue one.
boats.waa2.com/for-sale/halvorsen-25