Mule Skinners Blues

I’m not sure what the situation is with “Mule Skinner Blues” b/w “Cool Water,” Frontier 602, by bluegrass musician Red Allen.  Discogs lists it as being a 1953 release.   However, 45worlds lists it (and Frontier 601) as a June 1960 issue.  It is mentioned in the July 4, 1960 (and July 18) issue of Billboard magazine, so maybe it is from the summer of 1960.  Anyone know for sure?  I love a mystery.