France 1909 Amiens "Timbres de Grève". Issued during a postal strike by Chamber of Commerce, complete sheet of 25 stamps, containing the 2 errors: tête-bêche pair in top row and missing "C" in bottom row, minor separations between rows 2 & 3, hinged in selvage only (no photo). Maury No. 1, 1 var., 1a; €760 ($1,041)  Estimate $250 - 350. $0