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This is an example of an ambigram, I'm not so sure it's font specific but you could give it a try ! http://www.flipscript.com/ambigram-generator.aspx

Definitely not a font, but was based on blackletter/blackboard fonts.
Old English ( http://new.myfonts.com/fonts/itfmecanorma/old-english/ ) was used for "s", for example. Many of these letters are just rotated 180º