The signature of an individual in Siam, who cannot yet be idenfitied. The signature contains two parts: the first part, "สัปเลฟเตอร์แนนต์", appears to be a transliteration of the English word "sublieutenant" (perhaps the rank of the signatory), and the second part is apparently the name of the signatory and seems to be something like "สวนา" ("Sawana") or "สวาท" ("Sawat").
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Extracted by the uploader; the signature belongs to the signatory him/herself