JNF/Jewish National Fund Russia/Soviet 1918 Israel Week 30 unlisted purple stamp

JNF/Jewish National Fund (KKL) stamps & labels: Russia/Soviet Union Head Office issue, 1918 Land of Israel Week 30 kopek(?) denominated cinderella stamp (with Hebrew text & date) of the "Herzl's Vision" theme of the "Lamed" series, in purple - this unlisted in Rochlin (Su50 series in 2017 ed.; unlisted in Kaplove); no gum, very light surficial tear on back from apparent removal from mounting. Nicely centered.