Batman - Gotham By Gaslight & Sequel - Master of the Future (1989 - 1991)

The first Elseworlds title was Batman Gotham by Gaslight (1989). 
Althought it did not carry the Elseworlds LOGO.


http://www.filesonic.com/file/59002697/Gotham by Gaslight.cbr

http://www.filesonic.com/file/59002619/Master of the Future.cbr