below two pictures of 9th reverse
fist "WM" from my grand father collection (for me genuine 100%)
second economie "gilding" buy in GB for a few pouds (for me genuine 10%)---poor definition on reverse ...
the 2 badges had strengtheners (but not the same size ! )
....for me , fakers have copy the reverse of the genuine badges
badges with stengtheners are not a 100% genuine, but are not 100% copy too
cheers