I was having another good look at the pictures of this New type 1847 with no colons after REG, and noticed that instead of a gown with the elaborate lace neck line, which you find on all the other reverse Victorian copper types. This one has what looks like a Gorget breastplate , with the embossed head of Medusa set into the centre , its difficult to be sure though as it could be a chainmail neck piece with the embossed head of Medusa on a solid piece of metal set into the chainmail . Small breastplates like this were used on armour going back as far as the Romans, and has been used for decoration on some military uniforms right up to the present day . Pictured below is a Gorget worn be the German Military Police during the WW2, which I think looks remarkably similar to Britanniar's neck piece on this newly found type.