Made in England Royal Stanley Ware Stoke-on-the-Trent....Help Please :)

This is a very large teapot from my mom-in-law. She collected so much over the years. I need to clean it but took pics anyway. What I have been able to find out is it's Royal Stanley Ware by Colcough Co. Who it seems made their hand painted pieces from 1903-1928. It does have MADE IN ENGLAND on the bottom and Royal Stanley Ware with a crown. Then C&Co Longton Stoke-on-the-Trent England. It also has what appears to be a hand painted Z or N and what appears to be a hand painted b or 6 and 317 or possibly 3 h or 6...hard to tell. Also has what looks to be real gold painted on the spout, around the rim edge just above the rest of the hand painted design, and the top rim where the lid fits on. There is a chip in the paint on the spout and what appears to be a bit of rust telling me it must be metal under the paint, and it weighs nearly 2 lbs. It measures roughly 5-1/2 inches tall and 18-1/4 inches around. Can anyone elaborate more on this piece.