Here is another, on the Buywyze website that has the unusual slider seen on the sand cast badges posted in the other thread. However in this case its on a proper bronze badge?
WW1 City of Westminster Volunteers scarce VTC bronze cap badge.
Front View:-
http://www.buywyze.com/viewphoto.php...1020771&phqu=2
Rear view:-
http://www.buywyze.com/viewphoto.php?x=1