Definitions for "Screw back"
Keywords:  earlobe, clamp, ear, thread, nut
Case back with thread so that is can be screwed on to the watch case.
a secure earring mechanism accompanying a threaded post
Style of earring post where the post is threaded and the back resembles a nut.
Keywords:  tunic, merit, protruding, fastened, war
these are pieces in which the reverse has a protruding screw which goes through the tunic, and is fastened with a plate. This method is used instead of the pin back for security reasons. This method is found in the Iron Cross 1st Class and War Merit Cross 1st Class.