Dresden maker but unusual hallmark

[Theoderich]

This is the makersmark of Johann Emil Wi(e)d(e)mann in Dresden (1852)


This is the makersmark of Johann Emil Wi(e)d(e)mann with a head as hallmark



an other unusual mark of him


This is an other mark with this head and makersmark (JSR) ca. 1840



Johann Emil Wi(e)d(e)mann was living in Hauptstrasse 2 in Dresden Neustadt.
In 1856 (yearsletter B) he was a "Hofjuwelier" and "Beiältester".

Any idea what means this head mark?