Do You Recognize this Type of Handset?

[44lawrence]

Does anyone recognize what type of handset this is? There is no identification on it.  It is probably from the 1940's.  There is a button on the inside of the handset.  Not sure what the purpose was.   

[countryman]

The button normally is for a push to talk function. The handset might be from an intercom, field phone or radio apparatus.

[LarryInMichigan]

Are there any markings inside the handset or on the transmitter or receiver capsules?  Perhaps the button was for dictation.  It does not resemble any handset from a North American telephone.

Larry

[44lawrence]

No markings on the outside or inside the receiver . I didn't take transmitter apart. It does have a four wire conductor
   

[rdelius]

From Denmark

[countryman]

Oh, that's well observed:
http://www.erel.de/INH/21/2122300/index.htm
Still the ptt (?) button makes it special.

[44lawrence]

That phone pic looks pretty close. It looks like it was never used, the 4 spade ends look factory new