You're right Christian, it is "M.F. Taber" which is a documented counterstamp. The identification of Taber isn't positive, but it was likely issued by a man named M. Frank Taber of Salem, Ohio c1860s. He was a partner or officer in Taber & Co., a manufacturer of agricultural mowers. One of their products was called the "Improved Quaker" and was exhibited at the Indiana State Fair in 1869. Apparently, the company went bankrupt sometime in the 1870's. I'm going to do a little more digging and see what else I can find. There are presently 15 documented examples of his stamp, nearly all on Large Cents. The OP's is a new one. None had been reported on an 1835 Large cent before. Bruce