Thanks Ropestart and Scot your help has added to what sketchy info I have managed to get . From what I can see the Victa Tiger engine was fitted to the plywood hulls that boat builder Reg Craft made . Who made the alloy leg is still unknown ,perhaps Reg Craft sub let it out to a local foundry ,someone must have made the pattern...who ,would be good to know, it is quite a good casting. I have contacted VICTA but I did not get much information from them , I would have thought they would have something in their archives .
As I have a what I believe is a VICTA Jet I was told by Victa that the jet attachment was not a success and was eventually replaced with an out board attachment. I also contacted Riley's Boat Fittings in Carlton NSW as it was suggested they may have info on Reg Craft . I spoke to Bill Riley but he was unable to help. I am also waiting for the research dept of the Australian Maritime museum to respond.
Meanwhile I will proceed in restoring the unit.