Letter by Rebbe Yosef Yitzchak Schneerson of Chabad-Lubavitch (Rebbe the Rayatz), to Rabbi Chanoch Hendel Havlin, thanking him for the Etrog he sent him. Brooklyn, 6th of Tishrei 1949. His own signature. One year before his death, the Rebbe the Rayatz began to sign the letter Yud of his second name (Yitzchak) with a square (Ashuri) script, an amazing hint to his subsequent demise on the 10th of Shevat (expounded at length by his son-in-law the Lubavitcher Rebbe at the farbrengen on Shabbat Parsht VaEra 1951, see enclosed material). This letter was sent less than half a year before his death and his special signature appears with the square Yud. 21 cm. Very good condition.