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Original caption: —
Uploader's caption: Signature of Mongkut, king of Siam. It reads "SPPM Mongkut Rex Siamensium". SPPM is short for Thai "Somdet Phra Poramenthra Maha" (สมเด็จพระปรเมนทรมหา; literally, "His Divine Majesty the Paramount Indra, the Great"). Rex Siamensium is Latin for "King of Siam".
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