The Star of David that Herzl suggested as an emblem for the Zionist Movement appears on an Austrian postage stamp issued in 1985 to mark Herzl's 125 years birthday. The Hebrew caption is written wrongly, and this is the first time I see a typo on a postage stamp. Courtesy of Ronik from Israeli Collect Forum.
This blog (by Zeev Barkan) is dedicated to the Star of David, its history, its various meanings and usages in different cultures. It includes thousands of pictures of Star of David, six-pointed stars, hexagrams, Solomon's Seals, Magen Davids and yellow badges,and served as a resource for three books and four art exhibitions.