As it seems that few are willing to take a stab at this one and thus it isn't going to be identified in the short term, it's time to reveal and move on. It's the Barbaro RB.70 F-PTEL which first flew at Pau on 30 June 1972 and crashed, killing its designer/constructor René Barbaro and two others, at Montargis on 29 July 1972. Open house, please.