a difference of version information 9.1-902 jar and source

HI there,

I found a difference of version information 9.1-902.jdbc4.jar and
9.1-902.src.tar.gz.

9.1-902.jdbc4.jar:
$ java -cp postgresql-9.1-902.jdbc4.jar org.postgresql.util.PSQLDriverVersion
PostgreSQL 9.1 JDBC4 (build 902)

9.1-902.src.tar.gz:
$ ant
(snip)
BUILD SUCCESSFUL
Total time: 3 seconds
$ java -cp jars/postgresql.jar org.postgresql.util.PSQLDriverVersion
PostgreSQL 9.2devel JDBC4 (build 1000)

Is 9.1-902.src.tar.gz incorrect?

If the source tarball is incorrect, where is there correct 9.1-902 source?
There is not REL9_1_902 tag in CVS repository
(cvs.pgfoundry.org:/cvsroot/jdbc/pgjdbc).
Did I checked out from obsolete repository?

In addition, I care about whether 9.1-902 is a development version.

Regards,

--
OTSUKA Kenji