Very interesting stuff. So what happened to that four-division league?
Interesting indeed, while Bangkok Bank was the richest in football talents, they decide which division' trophy to go after. After winning a couple of division I(ถ้วย ก.), they then decided to move players down to hunt for division II, III and IV at deferent times. At one point, Thailand National Keeper was from division IV.
lokomotive is correct, division IV or ถ้วย ง. still exist but I have no idea of their admission criteria.