Thank you for the infos, Dr. Stinson. I was totally unaware of this first version (by Sompote Sands) of the Krai Thong legend, I thought he only made/produced the 1980 and 1985 (?) versions starring Sorapong Chatree. Do you know who were the stars of CHALAWAN?
It's always difficult to say if S. Sands directed ot not, as he is credited in a Thai movie database as having "directed" the 1980 and 1985 versions, when all other sources mention somebody named "Niramitr".
If I count well, there were at least 9 versions of the Krai Thong legend to date:
- the 3 Cambodian movies starring Dy Saveth
- the 3 Thai movies, "Chalawan", "Krai Thong" and "Krai Thong 2"
- the 2 recent (more or less!) movies "Krai Thong" and "Krai Thong 2" (Thai/Cambodian coprods I think)
- a porn version available from the web.
Do you know any other ? Thank you.

(of course, nine adaptations, it's not a great challenge in comparizon of the 25 or 30 versions of "Mae Nak Prakhanong"...)