I found residue of investment. I believe they used investment to protect the bakelite. Filling with investment letting solidify and then soldering with hard solder, then putting into water to dissolve investment, so bracelet remains hollow and light weight. That is my plan now for repairs. Will let you know if it works.
NO! this is the wrong way, continue on to other post to show how it is done. I was looking at it the wrong way. There is no way to hard solder and protect Bakelite. You must remove and then fix bracelet and then reset bakelite.