Thanks, Martina. Metal roses were used in Dutch harpsichords from the 17thc. (And are being made for harpsichord makers today). My own anon and fairly horrible guittar has a wooden one, but I looked at a Gibson in Dublin National Museum last week and it looked cast, and quite definitely mercury-gilt. Stamped roses could have been available at the end of the century, and would have been lighter in weight, but look identical from outside the instrument!
See the V&A catalogue etc., for examples of guittars with pegs, and guitar-style machines. Incidentally they own a Portuguese guitar (J.V. da Silva, Lisbon) with Gibson-style shoulders. On instrument names, no one has yet mentioned Praetorius' Klein Englische zitterlein, the guitar-tuned cittern which he raves about. Sir Peter Leycester writes of it in 1656 as known to him in his youth, "-we now usually call a Gitterne, which indeed is onely a Treble Psithyrne,-". Peter To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html
