2. Yes it is the histadrut - this is a May 1 poster, produced by the Histardut's Vaad Hapoel (which is basically the executive committee), Center for Culture and Education. That's all I can read!
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Sale 2302 Lot 156
SIGNATURE ILLEGIBLE [1956 MAY 1 / EVERYTHING IS FOR SECURITY OF ISRAEL.]
36 1/2x25 3/4 inches, 92 3/4x65 1/2 cm.
Condition B / B+: repaired tears at edges, some affecting image; abrasions and restoration along vertical and horizontal folds and in margins and image; losses in upper image; overpainting and restoration at edges and corners; ink stamp in right corners; writing in pen in lower right image.
http://catalogue.swanngalleries.com/asp/fullCatalogue.asp?salelot=2302++...
Estimate $700 - 1,000
Unsold
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Jewish & Israeli History and Culture
Lot no:
204
Posters
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HaKol LeBitchon Israel – Poster – 1956
"May 1, 1956, HaKol LeBitchon Israel." Design: Zila Binder. First of May poster published by the HaHistadrut HaKlalit shel HaOvdin HaIvri’im BeEretz Israel, Executive Committee, Center for Culture and Education. 1956.
Approx. 93X66 cm. Linen-backed for display and preservation. Fair condition. Professionally restored large open tear at lower right corner. Inscription in pen and ink-stamp on the poster.
https://www.kedem-auctions.com/content/hakol-lebitchon-israel-–-poster-–-1956