Mate, my pictures are not very good, it does look like an original, as it was kept in a pretty rough environment, it has patina in plenty!!! I am quite sure it is not an original rifle. I wondered if it may have been an early Dixie rifleworks kit, but I gather there may have been no kits as such available in the late 60s. It seems to be an early style by the butplate, and it has quite a lot of carving. It mounts nicely to the shoulder, but is muzzle heavy as the barrel is not double tapered. I have known the rifle since I was 14, and have allways been curious about it as it is the first custom longrifle I had ever seen. It does have "Century Arms Melb", "(Melbourne Victoria, Australia) crudely punched into a brass plate dovetailed into the top barrel flat. I have spoken to said company who deny all knowledge of it, claiming it is to crude to be something they would sell. It may have been marked that way to improve its local down under value. My mate bought it in 1970 at the Adelaide Gunshow, South Australia.
thanks for having a look
cheers
Gordon