Antique teapot

I have what looks like a small teapot.  It's a mirror image of the Royal China WillowWare piece pictured on EBay (link:  http://tinyurl.com/c5fyw6f), except for two things - my piece has a green design, while this and most other WillowWare pieces I've seen have blue designs, and the spout isn't completely flat - it droops down a bit at the end.  I can't really find one like it at any of the three antique stores in my area, nor can I find anything like it on Google, which is leading me to believe it's either rare, or a reproduction.  Really, I'm just wanting to know if it's a reproduction - this piece is too beautiful for me to want to part with, plus it's my great-grandma's.  :)

Here's a few images.  It still needs a fair bit of cleaning though.