Luckily for me my clock dial is constructed with numbers screwed to a square brass plate. I was able remove the glass door and unscrew the numbers leaving the brass plate. Originally the face had been silvered but there were areas which were worn, blackened and even dented. I rubbed the face back with steel wool and spray painted the face white. The screws holding the numbers on were the smallest I have ever used. At about 1mm diameter by 1mm long I struggled getting them started.