The first ones I saw here in Australia were in 1971. The 71 model came with the slimline tank but I have seen 1 or 2 with the 4 gallon breadbox. They were painted in that awful tiger gold with black panel at the bottom. I bought a new Bonnie in 72. Again here in Australia we got the general export model and as such mine had the breadbox tank as well. There was no option for the slimline. It was painted in Tiger Gold with white panels at the bottom. The 73 T120 then came out with slimline only in red and white.