Found it in the Auto World 1970 Summer catalog: it's the Riggen 1/24 Spyder RTR.
Seems to have been available in two different versions, both labeled Group 12: one with a Mura Group 12 motor and Riggen anglewinder chassis (brass I assume), and the other with a Group 12 approved 26D motor and a stainless steel chassis with brazed joints (not sure I've ever seen one of these in fact).
Other Riggen cars in these lines were the: Ford Mk4, Porsche 908, Abarth 3L, Porsche 917 PA, Ferrari 612, McLaren MK8...
Anyway, so yes, it's a Thingie/Dream Car/Outlaw.
Don