Almost all of Mueller's fonts are digitizations of typefaces that may be found in the Solotype Catalog. In almost all cases, Mr Mueller gave his digitizations new names.
His Ragged appears in the Solotype Catalog as Jagged. Similarly, his Mantel was originally called Bullfrog. Sounds like somebody got hold of these fonts and did a bit of historical renaming on them, no?
Hay Stack Wide
New Day Script