There are a lot of bells in Hillsboro style which don't bear the C.S.Bell name - either blank or the name of the retailer through which they were sold. But your second photo does seem to show that the original name was ground off. I have seen a couple of bronze bells where that was done, possibly to obscure the fact that the bell was second-hand. But why your bell was treated so, especially since it wasn't then disguised with paint, is surely a mystery.
Carl Scott Zimmerman
Saint Louis, Missouri, USA - home of 35 bell foundries or bell sellers, 1821-1961.