Thanks to Mike_Z and Jamie Bannon for helping me complete this set of cardbacks. (Also to Aussie James for the heads up)
The majority of these cards were purchased by my parents in Australia, with a handful sourced from other parts of the world. I did not see a lot of ESB offer cards on the pegs in Australia, when I started collecting as a child and believe this resulted in some harder to find cardback front and back combinations being created for our market.
Here is an even distribution of the 41 blue background cardbacks
41D
1. R2D2
2. Ben Kenobi
3. Darth Vader
4. Stormtrooper
5. Han Solo
6. R5D4
7. Hammerhead
8. Luke Skywalker X-Wing Pilot
9. Boba Fett
10. Bossk
11. FX-7
12. Rebel Soldier
13. Lando Calrissian
14. Princess Leia Bespin
15. Luke Skywalker Bespin
16. Yoda
17. Princess Leia Hoth
18. Lobot
19. 2-1B
20. Han Solo Bespin
41E
21. Luke Skywalker
22. Chewbacca
23. Princess Leia
24. C3PO
25. Star Destroyer Commander
26. Sand People
27. Jawa
28. Death Star Droid
29. Power Droid
30. Greedo
31. Snaggletooth
32. Walrus Man
33. Snowtrooper
34. IG-88
35. Bespin Guard
36. Han Solo Hoth
37. Rebel Commander
38. Dengar
39. Imperial Commander
40. Ugnaught
41. AT-AT Driver