I just found a little bit about them on a reddit forum from 2012, but I don't know how accurate the info is:
"Coast to Coast" is a series of hardware stores founded in 1928. Like many such stores, they sold guns from popular manufacturers stamped as "house brand" guns. Coast to Coast is now defunct, as in 1997 the company was merged into the TruServ Corporation, now know as True Value.
This morning I found a 'Store Brand Cross Over List' on the NRA Museum site. Don't panic when you see the Western Auto 100 listed as Mossberg Model 321...... Or panic I don't care
If anyone has a number of Store Brands this list would be worth printing off or adding to their bookmarks.
https://www.nramuseum.org/media/9409...ver%20list.pdf