I don’t have a picture of the C801 and there is not a picture in the Northern Electric service manual. There are pictures of a good many of their radios but they missed your model. I have attached some information from a Northern Electric service manual. The C800 and C801, according to the parts manual, uses the same chassis which includes the complete dial mask assembly including the dial mask and housing. So what you see for knobs and dial assembly on your C800 will be the same as the C801. I have attached two copies for the C800/C801 Specifications and dial assembly. I have also attached a copy of a 830/831 showing how Northern Electric has configured their Console and Table models.
Hope this somewhat helps