A note on the 9 card Limited Prototype set:

"The back of the promo cards that comes in this regular release is slightly different than the sub-set in the Emperor's Collection. On promo #3 the photo has been reversed, and #9 does not have the girl's name or 9 of 9 written on it."

This note has been quoted from page 26, of the Lasting Images price guide to Adult Entertainment & Fantasy Art Pinup Cards Volume 2, in the description for the 1993 Hot Shots Girl, Girl, Girls set (aka 1993 HS GGG1).