Pennybrix were a lego-style building set I had in the 70s, but instead of dots, the tops were made from a square split into 4 "corners" (difficult to describe). I think they got their name because you could a place a penny in the square on the top. They were only available in red, but you could get yellow wheels and blue roof tiles (which were individual and would require serious quantities to make a sizeable roof) You could also get windows and doors which could be installed as full units. I loved them and only betrayed them when Lego brought out its first Technical car (the one with the boxer engine and adjustable seats).
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