1873 or 1875
Fr Grégoire dies at sea
He did not long outlive the church. “What the building of this sanctuary cost him in cares and fatigues, God alone knows,” wrote his chronicler. Sent home on his doctors’ advice, Fr Grégoire never reached the end of the voyage: he died in the crossing of the Red Sea, anointed by Fr Victor Delpech. His two chroniclers agree on the day and differ only on the year: both put his death on 19 September — Auguste Jean in 1873, Dessal in 1875. He had been thirty years a missionary.
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In English
"The ship that carried him had just entered the Red Sea; it was 18 September 1873… He withdrew to his cabin, and at once the delirium declared itself. The next day, at six o'clock, the sick man opened his eyes, but without being able to speak… About two o'clock he gave his soul back to God."
What this source establishes
Fr Grégoire's death at sea. Read it carefully: 18 September is the day the SHIP ENTERED the Red Sea and the delirium began. He died "le lendemain" — the next day — around two in the afternoon. So Auguste Jean's date is 19 September 1873, and Dessal's is 19 September 1875. The two chroniclers AGREE ON THE DAY and differ only on the year.