BSA PISTON B33 SHTROD 9.5+070

This is a piston listed under part number R1210/070, marked in the catalog as a B33 SHTROD 9.5+070. That description points to a B33-model application rather than a Triumph, so this isn't something we'd expect to see cross a Triumph pre-unit or unit gearbox or engine order. We don't have much more detail on it in our records beyond that catalog line.