Unfortunately I don`t know the date of this performance. Best guess is mid to late 1980s. Recorded at Amamoor which I think means it was recorded as part of the Gympie National Country Music Muster which is held annually at the Amamoor Creek State Forest Park.
How about that young bloke close to the end of the clip, sitting on the fence watching them play, and pretending he was up there too? Also on YouTube there`s a fabulous live acoustic version of this song featuring the rather unusual sight (for me) of Phil playing acoustic guitar uploaded by guitarjjte that you should check out if you haven`t already.