KMOX.) From all accounts, KXOK was a beloved station for a certain generation of listener and has been described as St. Louis' American Graffiti. Tribute sites can be found here, here and here.
The above sticker probably dates to one of KXOK's post-1975 format changes which included Talk, Oldies and News. 630 AM is currently KYFI, part of BBN's network of Religious stations.