That high banker was made by Greg Wilson the son of the owner of the shop called Prospectors home , from memory Mr Wilson started the Paramatta prospecting club which may be be the one still going today in western Sydney , I still have my high banker which has a 2 inch dredging attachment the riffles are a lazy L design and lift up with minors moss green carpet underneath a very good machine , I also have a 6 inch dredge made by Greg but have not used it for 20 years they used to buy my gold when gold was at around 600 bucks an ounce .