"Help bring Hakhel to over 50,000 people in Boro Park and be entered into a raffle to win an original ksav yad from the Rebbe… a rare opportunity!" (source)
"The Rebbe wrote his name in a letter in Tishrei of 5711, and the ksav yad was copied onto the matzeiva, as befitting for a Yid who dedicated his life to the Rebbe." (source)