I have a commercial BSA with the patented upper and middle bands you are referring to. Other than the patent info, they look like any other band on the exterior. I don't have photos of the interiors but, if you do a search for a turn of the century BSA catalogue, you should be able to find pictures and a (glowing) description. Apparently, they were well represented at Bisley. Let me know if you cannot find it and I will try to get pics for you.