No need to fear the 2nd one. Strongly agree with Eric in that I personally would not buy it but not because it is not genuine, it's just not a very nice example. Bowie's autograph always looks better on LPs, posters, artwork and photos. CD's and Man Who Fell To Earth trading cards always throw out some weird interpretations of his signature.
The first one is stupendous and incredibly rare to see Bowie sign with love after 1975.