JNF/Jewish National Fund/KKL 1940 JNF Presidents brown se-tenant stamp pane MH

JNF/Jewish National Fund/KKL 1940 JNF Presidents brown se-tenant stamp pane MH
JNF/Jewish National Fund (KKL) stamps & labels: Israel Head Office/Jerusalem pre-State issue, 2 x 2 vertical set-tenant booklet pane of 1940 "Presidents of the JNF" in brown/yellow (Kap 385-388/Roch 514-517), MH & OG: firm paper with no obvious signs of folding along the perforations, without top selvedge; dark color anomaly(?) in upper field of top-right stamp.