Lee Schierer in McKean, PA
I've made a number of flag cases for friends and relatives. I glue the top joint without any reinforcement. I apply glue to both sides of the joint to prevent glue starvation. I believe that doing this makes a much stronger miter joint than applying glue only to one side. It allows both sides of the joint to suck in some glue before the glue starts setting up.

I usually make a larger base so there is a place to put an engraved nameplate.

Lee