Only 5-ish years late, better late than never I suppose, lol.......
I too have a copy of the 'Flight of Icarus' 7in mispressed with John Watts 'Mayday Mayday' on the b-side. I can tell you I rushed out and bought the single when it came out and stuck it straight on the death deck. Expecting thunderous Maiden, I was somewhat surprised to hear some insipid trash instead. BUT, I wasn't pissed off, being a collector, I was rather happy, followed quickly by "Damn it (or words to that effect), wished I'd have bought the other 10 or so copies in the shop. I also own a label pressing mistake on my 'Sanctuary' single, both labels show the a-side. Also, does anyone else have the 'Number of the Beast' 7in pressed on two different shades of red vinyl? One is clear red and the other is opaque.