Over the years I have purchased several belts in which the buckle attaches to the built by squeezing part of the metal buckle with metal  teeth into the end of the belt. It has never worked well and often comes undone while being worn. SURPRISE! It is a good idea and I keep hoping that someone will solve this obvious problem. The military has been much more successful for decades with this design though they also are not fail proof.

Added information on 06/21/2018:
For the past few days the buckle has stayed on. Perhaps it just needed a wear in period. The belt looks great and functions well as a two sided belt (black and brown).
The seller was concerned over the initial poor review and unilaterally offered me a replacement belt or a refund. This is a first for me. An offer of a refund without my requesting a consideration. I will not hesitate doing future business with this seller.