Thing with those signs is, Bulgarian didn't have fixed laws on transliteration  until recently (March this year if I'm not mistaken) and those signs are way outdated.
A Bulgarian would read both signs the same way, and it would be correct. Still I think the first one's a German transliteration and the second one's Polish perhaps? Maybe Czech? Anyway.
Here's the new law on transliteration: http://tr.im/pMgp - you probably wouldn't understand much but at least the table of letters is there.

SPOILER AHEAD!









The correct way to spell it is Koprivshtitsa :)