He didn't really need to be invisable, although he couldn't take whatever form he wanted. Before he was nearly destroyed (in the flood of Numenour I believe he could take whatever shape he wanted (ie:wolf, eagle, coney, etc.), but then the flood took that power out. Still, he was powerful enough while wearing the Ring he didn't need to make the Ring make him invisable. Although if you look at the topic <B>Sauron & the Ring</B> you'll get a larger range of opinions as well.
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