THAI FILM ARCHIVE
The Thai Film Archive or หอภาพยนตร์ (องค์การมหาชน) includes a Film Museum at the compound in Salaya.
The Thai company Lepso has got a big bunch of old 16 mm films (not less than 50 titles). It is said they have much more than Thai Film Archive itself. Lepso released many underrated 16 mm films. It is really a great source to study the roots of Thai film.
Thai Film Archive doesn't release so many old movies as they don't own the copyrights.