It came from someone who worked with Giger and had quite a lot of items which have now been sold by the company selling this item, some lithographs etc, yes agree about the Giger looking a bit strange but the star of David is an unusual addition and one a faker wouldn't normally put in as it makes it more atypical, however there's no COA or anything to authenticate it other than the price!
The card is an invitation to an Alien exhibition in Zurich in 1993 so a rare item in itself.