Unless the Title field is checked to print, the Company Name will not print on a mailing label.
This information was provided by Claris Corporation on 16 March 1998, and incorporated into Apple Computer's Tech Info Library.
When setting up a custom layout for a mailing label, unless the Title field is selected to print, the Company name field will not print, even though it has been selected. The solution is to select the Title to print as well.