While in The Netherlands it was called the CD-i Gold Club, in Italy there was also a CD-i Club. This sticker origins from the CD-i packaging of CD-i member Adrian Zanoli. It is said a sign-up card would be present inside the box, but that specific card is not there yet anymore. It seems that, next to the CD-i Magazine that was distributed in Italy, there was also a CD-i catalogue just as we had in The Netherlands. Original packagings of CD-i players are getting more rare and we don't see often the original box a these players anymore, so again it is a nice CD-i detail!
[Thanks, Adrian Zanoli]