There is one for sale on Gumtree at the moment though it is not identified as such.
http://www.gumtree.com.au/s-ad/sydney-city/sail-boats/yacht-for-sale-dutch-design/1130377314 24 footer usually built in Brunzeel mahogany ply to the 1/4 tonner rule. I would have given my left nut for one of these in the 70's. This one is for sale with an outboard and a mooring in Kogerah Bay for $1200. That is a reasonable price to pay for a mooring!
www.angelfire.com/art/ianprll/W24/