well if it's a print it is way more likely to be authentic.......when looked at from an angle a real auto will shine and look "floating" off the paper. i know that sounds basic but some may not know that. just helping out. good luck!!!! let's hope it's real.
I've seen little scraps of paper from the 70s signed 'Bowie' but never anything like an Aladdin Sane image. That's not to say they don't exist (love to see them if anyone has any pics of a known genuine) but this is also so clean. The 'i' so slow and with that dot at the top. The underline, a slow careful flourish. Really can't see it