I think this is from the Jerusalem 73 International Stamp Show, as the top line of Hebrew is Jerusalem 73, and has been issued as a fundraiser for the War. The show was scheduled for 1973 but due to war the exhibition was moved to the 25th March 1974 - 2nd April 1974.It looks like a Cinderella item and not for postage. On the right edge is a donation for the orphanage [does not say which one] but it is probably for orphans from the war. It may have been issued by either the KKL charity, the show organisers or another charity.
[LAOPHIL: Please translate the Hebrew, Thanks]
I don't think it was issued by the KKL or the organizers, looks like a private issue, maybe by one of the exhibition dealers (The Hebrew writing is not so good).
As I have already written, all stamps have connection to Egypt, Sinai desert and Gaza. Translation:
USSR stamp: Ivan Franco - the epic "Moses"
Germany stamp: Handel - the opera "Israel in Egypt"
Italy stamp: Rossini - the opera "Moses in Egypt"
Israel stamps: Saint-SaŽns - the opera "Samson and Delilah"
Czechoslovakia stamp: on the top a phrase from the Book of Exodus about Sinai desert "for the place whereon thou standest is holy ground". In the bottom: Concert - Marcus Beth Lehem 73 "Christmas Bells for peace in the Near East".
Photo of Jurgen Marcus: Alexander Serov - Jurgen Marcus as the "Angel" in the opera "The Burning Bush".
I don't think an official body collected money for war orphans. In Israel, the Ministry of Defense, which is responsible for the families of war victims, gives them financial support for life.