In the 1770s Pierre Jaquet-Droz, a Swiss watchmaker, built a mechanical doll (automata) that could write holding a quill pen. By switching the number and order of its internal wheels different letters, and hence different messages, could be produced. In effect, it could be mechanically "programmed" to read instructions. Along with two other complex machines, the doll is at the Musee d'Art et d'Histoire of Neuchatel, Switzerland, and still operates.

Answer this question, if possible (if impossible, reply "unanswerable"): When did Pierre Jaquet-Droz build a mechanical doll that could hold a pen?
In the 1770s