Bloody hell, Cpt Bloggs! That looks like A3-116 in which I spent the most exciting hour of my life on 24th Jan 1980. (Just checking the date on my office wall "MachBuster certificate". An engine air test in the then 77Sqn dual Mirage. Flying through the speed of sound. Then later, hooning low level around Myall lakes. Sadly, A3-116 was broken up but the fin is preserved outside the Australian Air League HQ at Coffs Harbour Airport. On my infrequent visits there, I give it a slap and kiss. Thanks, so much to my pilot Brian Johnson. I wonder what you are doing these days? Cheers, Despot 20.