HFF Thai Dye
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It look more like khmer letters style than thai letters style.
HFF auteur de HFF Thai Dye
You are probably right. However, the original font name in the Solotype Catalog is Siamese and I took it from there when I named my font. This is likely a phototype possibly from Filmotype as Solo had tons of fonts from there.
Actually it looks very close to Tamil or Malayalam!