question #3 Sahih al-Bukhari 5875, Book 77, Hadith 92 : How did cultural practices influence the Prophet’s decision to use a stamped letter for communication?

When the Prophet (ﷺ) intended to write to the Byzantines, it was said to him, “Those people do not
read your letter unless it is stamped.” So the Prophet (ﷺ) took a silver ring and got ‘Muhammad, the
Apostle of Allah’ engraved on it …. as if I am now looking at its glitter in his hand.