Is it a business letter? According to the information on this site,"Your full typewritten name and designation (on separate lines) should appear beneath your handwritten signature."
All the best.
If one's title contains professional credentials; e.g. Dr., Prof. or knighted under a British system - Sir so-and-so. Would they put this after they have signed? Your sincerely, sign, Sir Andrew Smith or should it remain Andrew Smith or bracketed Andrew Smith (Sir)?
One wouldn't use his professional honorific in his typewritten signature. That is, he wouldn't put "Dr. John Bonebreak" or "Sir Frankie Crisp." He would, however, include his credentials: "John Bonebreak, M.D." or "Frankie Crisp, K.B.E."