Once the Prophet (ﷺ) wrote a letter or had an idea of writing a letter. The Prophet (ﷺ) was told that they (rulers) would not read letters unless they were sealed. So the Prophet (ﷺ) got a silver ring made with "Muhammad Allah's Messenger (ﷺ)" engraved on it. As if I were just observing its white glitter in the hand of the Prophet.
Reference: Sahih al-Bukhari 65 In-book : Book 3, Hadith 7 USC-MSA web (English) : Vol. 1, Book 3, Hadith 65 (deprecated)
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