Snail Mail Supreme

I'm sorting through old postcards sent to my mother and come across one from the Koeiau Quartet of the 'Inside of the Emerald Buddha Temple, Bangkok'.

It is postmarked Chiangmai Airport with a date of 31.10.45 (Ocober 31st, 1945).

Mum and I work out the Quartet gave a private concert in San Luca in 2002, so it is a misprint, some dozy clerk at the airport post office accidentally knocking the 'year' out of synch.

One has no idea how much mail went out under this wrong year, but isn't this the sort of thing that serious philatelists pay large sums for?

I have told Mum to file this away, in case.