This is a beautiful American wall telephone. It has an adjustible double gong mechanical bell. I have fitted an electronic microphone
and a quality grey line in cord with a UK telephone plug socket. This came with no handset and so I added a new old stock red handset and handset cord. It has been fully tested and working perfectly on our UK landline. No dial lable info is available as it will be supplied with the American one as in the picture. These coloured versions of this model are hard to find and so always grab them when I can. The bottom is marked No 554 B 1976 which I assume is the 500 series wall version model number.