One big question is why? Are you looking to sell it? If so, it might be easiest to speak to a local stamp dealer or a local stamp club.
You can find a list of Dealers and Clubs in Israel at
http://www.geocities.ws/stamplink/i...aldlr/il.htmIf you are more interested in taking up stamp collecting (which I hope you would) and understanding what you have, then this is a great place to start, but also you could join a stamp club as well.