The signature of the Greek poet and literary critic Tellos Agras (real name: Evangelos Ioannou).
Letter of the author shown here: https://cavafy.onassis.org/el/object/82zx-rm92-9p8q/ // Επιστολή του συγγραφέα που παρουσιάζεται εδώ: https://cavafy.onassis.org/el/object/82zx-rm92-9p8q/
Tellos Agras (1899-1944) // Τέλλος Άγρας (1899-1944)