I think there's an 78rpm-acetate on sale every now and then at Sotheby's including "You Can't Judge A Book", "Soon Forgotten" and "Pretty Thing" - I missed it last time as I learned about it about 5 days too late. That was back in 1992/1993 but it was not that cheap at all - somewhere around GBP 6.500 if I remember correctly.
Thanks Rockman - silly me :-) I begin to mess things up more and more, must be a sign of age...
Joe - it was collector named Chris (Eborn ? I fear I'm wrong again) who bought this item when it was on auction for the first time, but not Chris Jagger. As a second acetate was offered (the one I wrote about) it wasn't sold. Still I would like to buy it if I only knew who's the one who tried to sell it.