I was hinting a bit as I do indeed recall it from Observers circa '68 or 70... Kind of sad that this version didn't enjoy series production as it's quite an attractive machine - the Bush Hawk is a bit... well... Recall seeing one at Oshkosh, one of those odd types you might never see anywhere else except rugged areas north of the 49th parallel!
I'm quite happy in the back seat, if Noyade or kcockayne would like to post the next challenge!