This newspaper ad takes us to September of 1960 and was published in the Philadelphia Inquirer newspaper. I've seen the 'N' designation before, but have further study to determine if this was used solely by the Inquirer, or if it simply ties it to the original pattern by Needlework Bureau. I also found 9/1960 advertisement showing it released as Audrey Lane in Oklahoma.
Typically the pattern numbers did not change when rebranded. For example, the American Weekly designs were all Alice Brooks Designs. I'm sure I'll find more references to rebranding of numbers.
Thanks for dropping by,