MARCONI 365A WITH WRONG NAME 365C
The top photo is of the 365A key received and was marked with embossing tape on one side as a 365C. Actually it is a 365A missing all the rear contacts hardware, and the two labels normally on the base side and front.
The next photo is what an original complete Type 365A key looks like, on the top side.
This photo shows the very top view of both keys for comparison.
This photo shows the bottom side of both keys for comparison of missing hardware on the left key.