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Heemaf 1955
Analogue desktop telephone set

Heemaf Model 1955 was a standard analogue telephone set for desktop use with pulse dialling, in a black bakelite enclosure, developed in 1955 and manufactured by the Heemaf machine factory in Hengelo (Netherlands) for the Dutch state-owned telecom monopolist PTT 1 . The set was intended for use on the Dutch public switched telephone network (PSTN) 2 , or POTS. 3

The image on the right shows an example of the Heemaf 1955 in mint condition, as if it has just been unpacked. It is shown here with the rare extra speaker option that is seated in a cradle at the back of the set. It can be very useful in noisy environments, or for allowing another person to listen-in on a conversation. The extra speaker only works whilst its rectangular button pressed.

The white circular dot on top of the set, just above the dial, is the so-called ground-button which was used to put a call on hold on a local PABX, and to pass calls on to another extension.
Heemaf Model 1955

On some models, the white ground-button is missing, in which case the black PTT logo is shown in black at this location. The set is housed in a shiny black bakelite enclosure, designed in 1954 by Dutch graphic artist and industrial designer Gerard Kiljan (1891-1968) [1]. The interior of this set is very similar to that of the Ericsson Model 1951 and the Standard Electric Model 1954.

The phone was manufactured for the Dutch PTT by the Heemaf factory in Hengelo (Netherlands) from 1955 onwards, well into the 1960s, after which the PTT gradually replaced them by the newer T-65 models. In 1970, some of the surplus Heemaf Model 1955 phones became available to hobbyists and collectors in the US through Tandy/Radio Shack outlets [2].

  1. PTT = Staatsbedrijf der Posterijen, Telegrafie en Telefonie (state-owned company for post, telegraph and telephone), privatised in 1989 and currently known as KPN.  Wikipedia
  2. PSTN = Public Switched Telephone Network.  Wikipedia
  3. POTS = Plain Old Telephone Service, or Plain Old Telephone System.  Wikipedia

Heemaf Model 1955 Front view With handset off-hook Dial Number shield and circular ground button Extra speaker (optional)
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Heemaf Model 1955
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Front view
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With handset off-hook
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Number shield and circular ground button
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Extra speaker (optional)

Heemaf 1955 on this website
The Heemaf model 1955 is featured on the following pages of this website.

Dutch Radar Laboratory   NRP
The image on the right was taken around 1961 and shows radar developers Gerhard Prins and At Admiraal at work in one of the offices at the Dutch Radar Laboratory (NRP) in Noordwijk. They would later become the directors and finally the owners of the company.

The NRP is known for their early developments in radar, but also for their special equipment for the Dutch Radio Monitoring Service (RCD) and the American Central Intelligence Agency (CIA).

 More information


Wireless Easy Chair   WEC
In 1960, the Dutch Radar Laboratory (NRP) in Noordwijk developed a covert listening device (bug) for the Central Intelligence Agency (CIA), that used an existing analogue telephone set for eavesdropping on a conversation in a room.

This was done by connecting the WEC device shown in the image on the right at a so-called tapping point and injecting a strong RF signal. It was first tested on the Heemaf 1955 and works even when the set is on-hook.

 More information


  1. Vince Budnick, Some history on phones from the Netherlands
    Retrieved March 2017.

  2. Various contributors, Classic Rotary Phones Forum
    Retrieved March 2017.

  3. Arwin Schaddelee, Matilo telephones, Heemaf type 1955
    Retrieved March 2017.
Further information
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Crypto Museum. Created: Thursday 30 March 2017. Last changed: Saturday, 04 November 2017 - 09:26 CET.
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