The Collaborative International Dictionary of English v.0.48:

Letterer \Let"ter*er\ (l[e^]t"t[~e]r*[~e]r), n.
   One who makes, inscribes, or engraves, alphabetical letters.
   [1913 Webster]

WordNet (r) 3.0 (2006):

letterer
    n 1: a painter of letters

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "letterer":
   amanuensis, calligrapher, chirographer, clerk, copier, copyist,
   ink spiller, inkslinger, pen, pencil driver, penman, penner,
   recording secretary, scribbler, scribe, scrivener, secretary,
   transcriber, word-slinger, writer