how to diff against an version prior to a file move?

I have a file, bin/svnfix, that is in subversion. It was svn mv'd from
bin/cvsfix a while ago. Long before that (when it was still in cvs), I
checked in what is now revision 739. I want to see what changed in that
revision. svn log shows the commit message for 739, but it is not very
useful.

joey@dragon:~/bin>svn diff -r 739:738 svnfix
svn: Filesystem has no item
svn: 'svn+ssh://kitenet.net/home/svn/joey/trunk/bin/svnfix' was not
found in the repository at either revision 739 or 738

joey@dragon:~/bin>svn diff -r 739:738 cvsfix
svn: Can't find an entry
svn: convert_to_url: 'cvsfix' is not versioned

joey@dragon:~/bin>svn diff -r 739:738
svn+ssh://kitenet.net/home/svn/joey/trunk/bin/cvsfix
svn: Filesystem has no item
svn: 'svn+ssh://kitenet.net/home/svn/joey/trunk/bin/cvsfix' was not
found in the repository at either revision 739 or 738

I'm pretty sure that trunk/bin/cvsfix is the original name it had in the
repository. What am I supposed to do to get at the old version of the
file?

-- 
see shy jo