It is indeed The Jewish National fund, from 1902.
Here's a PDF catalog in Hebrew, but you can see the years and images:https://www.kkl.org.il/files/HEBREW...900-1909.pdf
There seem to be two catalogs that list them, Kaplov and Rochlin.
About JNF stamps (google translate, sorry):
Since the Fifth Zionist Congress convened in Basel in the month of Tevet 1902 (December 26-29, 1901), on the establishment of the Jewish National Fund, the JNF stamps have been used, in addition to being a means of redeeming the lands of Eretz Israel and a fateful partnership. For national renewal and a means of information and education.
The "Stamp of Zion", the first stamp issued by the JNF in 1902, was distributed in 17 countries and its price was the smallest currency value in any country, out of a desire to make the idea of #8203;#8203;redemption accessible and available to all Jews around the world. The JNF stamps alongside the official stamps of the countries in which they resided, sometimes with a heavy personal risk of fines and even imprisonment. Since the JNF issued the first stamp, the KKL-JNF stamp factory has produced about 5,200 different types of stamps, including about 1,500 series, which accompany and describe the activities of the Zionist movement and the JNF, events in the life of the people and the nation. Israel.