German teapot

Teapot with stamp on bottom that I think says "Christel" handgemalt feuerfest also a sticker/label that is peeling and can only make out the words feuerfest and a crown with a cross on top and I think an S on top of the cross. Found at a thrift store. I can't find anything specific when I type in those words. Based on translations handgemalt is hand painted and feuerfest is fire proof but I don't know who the maker is. Any information on this teapot is greatly appreciated.