Doar Ivri 1000m short tabbed single stamp 11x11 rough perf misaligned, used

Israel 1948 Doar Ivri high values perforation variety: 1000mil tabbed single stamp on medium blue paper with 11x11 perforation, used & tied by 6-5-1949 TABUL illustrated cancellation; the perforation is rough & the horizontal perforations are misaligned (21 holes in the center and 20 on the top); this issue is known imperforated at the base: here unclear if the the tab has been slightly shortened or if the imperforated base is natural (the distance is exactly 21mm from the base of the end perforation holes to the base of the tab). Expertised on back with micro signature Burger BPP.