The painting on both of these vases is quite artistic, they look different with each quarter turn, at first I assumed they would be decor Breetvelt vases.
Decor Prinsenhof is also not always the same decor, a number of different decors exist all named Prinsenhof. They appeared around 1920 and were all painted by Cornelis Prins; it took a few years before other painters also produced these decors. It is possible or perhaps even likely that Mr Prins designed and painted his own Prinsenhof decors.
Another piece painted by Mr Nonner can be found
HERE .