Thanks Test. I have seen it but have yet to add it to my collection. Tongdee's artwork is incredible, wish it was more widely used and recognized.
There's lots of fantastic Flash Gordon posters out there, but, I certainly agree with you that the Thai versions are up there with the best of them, I also agree about Tongdee, easily IMO one of the best poster artists in the world, and I think nowadays lots more poster collector's are starting to see just how good Tongdee's work is.
I have both of the Flash Gordon Thai posters, I've had them in my collection for a while now, you can't go wrong with either of them, both are great!
Here's my portrait version for anyone that wants to compare the two versions