He kept it rolled up for years and never considered throwing it out, as others I daresay did with the posters they may have had from the event.
It was a basic three-colour sheet which showed the names of the British bands, the venue and the show time.
He got it from a music shop window in Cuba St or somewhere and the shop crew were happy to give it away...they'd only throw it out anyway.
So he kept it rolled up for about 40 years and decided to taste the waters of potential sale through an auction house in England.
What he had raised eyebrows because it transpired it was one of only two of those posters believed to have survived...from a hundred or so which had been printed off.
So he sold it.
Result?
Let's just say it came to five figures and the first figure was a 3.
Accordingly, he provided the drinks on the Saturday after the payment came through.
But he frowned at one stage and shook his head as we talked about it.
"I saw a couple of other ones but because I had one I didn't bother grabbing them..."
He had nothing to be frownful about I said, reminding him that I once had an original poster from the 1972 Rolling Stones concert I went along to at Western Springs...and somewhere along the way I simply lost it, or gave it away, or whatever.
They're worth very, very good money today...sigh.
Indeed, what does money mean?
What is something really worth?
Well, the great and tantalising Lotto powerpill thing was rolling around the $25 million mark a while back there and that is an enormous sum of cash.
That's effectively an income of half-a-million spondoolies a week for a year and who would sneer at that?
Well I know one bloke.
His name is Carlos Tevez and he kicks a ball around for a living.
Not a bad one either, for he has been offered $132,730,648 to join Shanghai Shenhua in the China Superleague where he will kick a ball around...for two years.
So then children...calculators at the ready.
Divide $132,730,648 by two and then divide that figure by 52 and that's what he will get for each week of kicking a ball around.
Basically, and figures bewilder me, it comes down to around $1,275,000 a week...yep, a million and a quarter for seven days...of kicking a ball around.
So without getting too tied up with the exact figures put it this way.
That's the equivalent of winning the $25 million Lotto powerpill bonus thing every five months...for two years.
Now I don't deny anyone a very big wage if they're kind of doing something to justify it.
But kicking a ball around?
I'm not surprised though that this offer has emerged from China where there appears to be absolutely no shortage of cash or reasons how to spend it.
How the hell did they get that sort of capital to purchase just one player?
Are they getting fresh water from somewhere for nothing and selling it for top dollars or something?
Oh, and then I spotted another case of big spending, which underlined that for some the addition of six or seven zeros behind a figure is not an issue.
But in this case I was astounded, because the figure was $430 million - that's what Australian mining magnate and philanthropist Andrew Forrest is donating to a variety of social, medical and scientific causes.
It will be a six-way split with a big slice of it heading in the direction of finding a means to make cancer history.
And there's money going for the education of kids - millions of dollars worth.
Worthy causes and a worthy use of money from a bloke who is happy to give it away.
I wonder how much Mr Tevez will give away...because if he were to play six seasons for the Shanghai club the near half-a-billion Andrew Forrest is giving away is about what he'll gather up...for kicking a ball around.
Am I missing something here?