This is the eventual solution to the problem. The important thing is that the URL for the repository in the sources.list should be the full one containing the repo for the required package, in this case http://snapshot.debian.org/archive/debian/20150924T154447Z/. There is a good write up at http://mindref.blogspot.co.uk/2012/02/apt-revert-upgrade.html and also explained in a related question – What is the proper syntax for pinning a debian package to a repository and a version?
/etc/apt/sources.list.d/snapshots.list
# snapshot.debian.org
# added for subversion 1.9.2 subversion bug #803725
deb http://snapshot.debian.org/archive/debian/20150924T154447Z/ unstable main
/etc/apt/preferences.d/subversion
Package: subversion libsvn1
Pin: version 1.9.2-1
Pin-Priority: 700
apt-cache policy subversion
subversion:
Installed: 1.9.2-1
Candidate: 1.9.2-1
Package pin: 1.9.2-1
Version table:
1.9.2-3+b1 700
500 http://http.debian.net/debian/ unstable/main amd64 Packages
*** 1.9.2-1 700
500 http://snapshot.debian.org/archive/debian/20150924T154447Z/ unstable/main amd64 Packages
100 /var/lib/dpkg/status
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