The "Hebrew clock" is still there (as of 2016) and is part of the Jewish Town Hall in the Josefov section of Prague.
The "Christian clock" is the Prague Astronomical Clock, also known as the "Prague orloj". It is the third oldest astronomical clock in the world, and the oldest still working. The clock suffered major damage in May, 1945 at the end of World War Two. It was restored and back in operation in 1948.