..about the 3d rosette. It's just simply little blocks in the groove where the rosette would be. A small touch, but interesting compared to the often-purchased and inlaid complete rosettes.
I'm going to hazard a guess that before ebay had complete rosettes inexpensively, it was probably easier to cut a bunch of identical blocks to the proper size and glue them in where the rosette would be.
But I'll ask George.