 Duncker aiva neukama hwezvematongerwe enyika hwaienda kure uye aigara achinyorerana naMambo Friedrich Wilhelm IV. Gare gare, akaramba achisangana naMambo William I. Kubva muna 1841 akabata zita rokuti Royal Court Bookseller. Somukuru mukuru wezvokuchengetedza akawana chinzvimbo chaLieutenant Colonel, akabatanidzwa muhondo dzairwisana neDenmark1864, Austria 1866, uye France 1870-71. 