Yet another metric used to define an initial release is the date of
the 1.0 version.
From the first archive capture [1] this is "Postgres95 1.0 ... Tue Sep
5 11:24:11 PDT 1995"
I'm also digging the first logo [2]. It seems to be influenced by
Kool-Aid Man with a lens flare = awesome.
[1] http://web.archive.org/web/19970208171725/http://postgresql.org/history.phtml
[2] http://web.archive.org/web/19970613233238/http://www.postgresql.org/img/postgreSQL.jpg