You're right, it's τὸ ἀληθές > τἀληθές. The thing that looks like the smooth breathing mark is called the coronis in this case and it's used to indicate that the two words have been contracted. It usually occurs with smaller words that are closely bound to the word that follows, so I don't think it happens with τε. You can also look at http://books.google.ca/books?id=dBUBAAA ... RA1-PA5,M1
for more examples, under crasis.