That appears to be a standalone message of some sort. Judging from the condition of the surface, it can't have been very important to the sender. They probably didn't think very highly of their culture. Nonetheless, the presence of the message makes me think this might've been a place of honor, commemorating some esteemed deed.

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If you have a fediverse account, you can quote this note from your own instance. Search https://f.duriansoftware.com/users/joe/statuses/115652630469526965 on your instance and quote it. (Note that quoting is not supported in Mastodon.)