This brass brooch had a nice patina to it, I'll leave it as it is, and if you buy it and want to clean or polish it, that will be up to you.  It is very thin and has an older looking closure.  I honestly don't know if it was handmade by someone and the closure was added or if it is on the older end of the vintage timeframe.  What I do know is that it's unique and pretty and would be loved by someone who collects teapots or appreciates unique brass brooches.