Quite possibly the best Who concert I attended - though 1969 would run it close. Both featured 'Tommy' extensively and it's not even my favourite album!
Why would they strike millions of coins then overstrike each one? No, as Martin says, it's the die that gets recut either to reuse it or to correct an error or to recut wearing characters.
Thanks Mike. It's hard to determine a VIP proof when there were normal proofs in that year. Why wouldn't they issue VIPs with early strikes of an 'ordinary' proof set? In any case, the real determiner - the penny - is the normal proof issue, as has been pointed out.
Why is Tony Robinson coming to mind?
Mind you, that other advert for a grossly overpriced gold coin does quote the name Pistrucci .. wonder who that's aimed at?