Letter from Rebbe Menachem Mendel Schneersohn - the Lubavitcher Rebbe, with his signature. Brooklyn NY, 12th Nissan 1954.
Typewritten on the official stationery of the rebbe, with his signature.
Addressed to R. Chaim Nachman Kowalsky (1892-1978), with blessings for good health and success both in material and spiritual matters, and Passover wishes.
[1] leaf, official stationery. 21.5 cm. Good condition. Folding marks and creases. Minor stains.

Letter from Rebbe Menachem Mendel Schneersohn - the Lubavitcher Rebbe, with his signature. Brooklyn NY, 11th Nissan 1961.
Typewritten on the official stationery of the rebbe, with his signature.
Addressed to R. Chaim Nachman Kowalsky (1892-1978), with blessings for a kosher and joyous Passover, in true freedom, both from material and spiritual worries. The rebbe continues to wish him that the freedom and joy should be drawn over into the entire year, and concludes by thanking him for the wishes he sent on the occasion of the rebbe's birthday.
[1] leaf, official stationery. 21.5 cm. Good condition. Folding marks. Minor stains.

Letter from Rebbe Menachem Mendel Schneersohn - the Lubavitcher Rebbe, with his signature. Brooklyn NY, 12th Nissan 1965.
Typewritten on the official stationery of the rebbe, with his signature, and the addition of several words in his handwriting.
Addressed to R. Chaim Nachman Kowalsky (1892-1978), with blessings for a kosher and joyous Passover, in true freedom, both from material and spiritual worries. The rebbe continues to bless him that the freedom and joy be drawn over into the entire year, and concludes by thanking him for the wishes he sent on the occasion of the rebbe's birthday.
At the end of the letter, after "with holiday wishes", the rebbe added in his handwriting: "for good tidings".
[1] leaf, official stationery. 21.5 cm. Good condition. Folding marks and creases. Stains.

Letter from Rebbe Menachem Mendel Schneersohn - the Lubavitcher Rebbe, with his signature. Brooklyn NY, Erev Sukkot 1964.
Addressed to R. Chaim Nachman Kowalsky (1892-1978), with thanks for the condolences he sent upon the passing of the rebbe's mother, Rebbetzin Chana Schneersohn (28th Tevet 1880 - 6th Tishrei 1964).
The rebbe concludes the letter with blessings for good tidings and a joyous festival.
[1] leaf, official stationery. 28 cm. Good condition. Folding marks and creases. Stains. Minor marginal tears.

Letter from Rebbe Menachem Mendel Schneersohn - the Lubavitcher Rebbe, with his signature. Brooklyn NY, 26th Kislev 1971.
Typewritten on the official stationery of the rebbe, with his signature, and the addition of several words in his handwriting.
Public-private letter addressed to R. Chaim Nachman Kowalsky (1892-1978), in honor of Chag HaGeulah of the Baal HaTanya - Yat (19th) Kislev, and in honor of Chanukah.
In his letter, the rebbe explains the double virtue of Yat Kislev that year falling on Tuesday, the day on which G-d declared twice "it was good", and blesses that this should inspire each and every person to redouble their efforts and activities, in the study and teaching of Torah, and performance of acts of kindness, imbued with a love both for G-d and fellow Jews.
At the end of the letter, the rebbe added his handwritten blessings for "success, longevity and good tidings".
References and sources of the ideas mentioned in the letter were printed at the foot of the letter (most of the sources were printed on the second leaf of the letter, which is not present).
[1] leaf, official stationery. 28 cm. Good condition. Folding marks and creases. Stains.