I'm fine to change your address if your order hasn't been shipped yet. Once I ship it, I can no longer change your address. My advice is to reach out to your local post office! If not, you'll have to wait your package returns to me.
Since enamel pins are an handmade product, it's very likely I'll get some pins with defects. "Seconds" are pins with defects.
A grade pins are perfectly good pins
B grade pins have minor defects that don't affect the design itself, like small stains, scratches, etc.
C grade pins have more serious defects like missing enamel (tint), bigger stains and scratches.
Both B and C grade pins are recommended as pins you use on your daily life or at a convention. They're obviously cheaper than A grade pins, so if they get damaged or lost, it's better than losing an A grade pin.
All pins are made in China. They're handmade products, that's why it takes longer.
They're also a big investment to make, since you can't order just 5 or 10 pins.
Usually, pins take around 4 weeks to be made, but I prefer to set the shipping time a bit later just in case there are any issues. I've had to redo a whole batch of pins before, so I like to be cautious.