Card Guide" there have been at least 3 back designs, in 2 colors each for O'Shea's.

The first decks were Paulson with white backs and had the stylized "O'Shea's" name (logo) in green and brown.

Then came Paulson decks in green and red backs (web design (squiggly lines)) and the "O'Shea's" logo was oval shaped.

The third design was similar to the second, but was made by Aristocrat in their diamond design, with green and red backs.

I have not included scans because my decks are packed away and the Guide is a copyrighted work.

I hope this help,

Jim