The cover of Aram Andonian's "Massacres Armeniens". The documents in the book were all forgeries. Andonian made his most fatal mistake with the date. He was obviously not well enough versed in the tricks of converting to Rumi year of the Ottomans, where a difference of thirteen days between the Rumi and Gregorian calenders must be taken into account. The date he put on the letter was off by a full year.
Reference : A Myth of Terror.