A typical design of the 1980s, this was actually a Swiss model. Originally developed by a firm called Ascom this model was originally called the Tritel Elm and also used by the Swiss PTT. It was also sold on the open market with other versions of this model as well, with additional functions and different button arrangements. Dutch PTT marketed it under the name of a city, as they did with most of their models in this period. Often the name of the city referred to the country where the design originated.
PTT only had one version in different colours, green and white being the most common. Lucky for me there was also a brick red version, which I was able to add to my collection of red telephones.
Although a fully electronic telephone, with a pcb with micro-electronics, it is compatible with both analog and digital dialling. It has jumpers which can be set to pulse dialling, touch tone (DTMF) and hybrid. When the hybrid setting is selected the numbered keys generate pulse dialling and the other generate a DTMF signal. Many of the electronic telephones of this era have a pulse and tone setting, but this is the first I have seen with an intermediate option, the purpose of which is unclear to me.