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It is a very cool design. If you plan on doing a lot of them you could get a cheap scroll saw from Harbor Freight along with a bi-metal blade. They also have a 25 piece domed punch set. With that you could raised or embossed badges.
 
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Did you use a polished sheet of alum., tape a printed sheet of paper, then engrave through it? Did you use a dremel w/bur or a engraver? Thanks!
 
The copper one I etched with the "toner transfer" method, hydrogen peroxide and muriatic acid.

Lots of info online, here's a couple links:
http://makezine.com/projects/pcb-etching-using-toner-transfer-method/
http://www.instructables.com/id/Stop-using-Ferric-Chloride-etchant!--A-better-etc/

The shiny silver badges are nickel-silver, also called German silver. These I had a friend make some plotter-cut vinyl stickers for use as the "resist". The toner transfer method allows bleed-through giving a distressed look, the stickers don't have any bleed, so the edges are crisp and non-etched surface is left smooth.
 
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OHP you have one steady hand. Every time I have tried to use a dremel to make letters I end up slipping and cutting off a piece of a letter. Looks great!
 

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