I thought I would post a photo of my take on hermione’s SPEW badges from Goblet of Fire. As far as I can tell SPEW was pretty much entirely left out of the movies, but I wanted to make something that I reckoned would fit in with the aesthetic of the wizarding world that we see in the movies. Being muggle-born, hermione probably could’ve got access to a modern badge maker, but I think she would’ve been more likely to use wizarding techniques. Maybe even a similar method to how she made her bewitched gallons for the DA in OotF? We never learn an awful lot about exactly how magical objects are made.
I did the CAD on Rhino, then milled it out in wax on a Revo machine and cast in brass. Soldered on a simple brooch fitting to finish and oxidised the engraved sections to bring up the lettering a bit clearer.