Unusual Ceramic Bottle with Geode Topped Stopper / Marked / Unknown Age

This is a very strange piece! The bottle is made of a gritty grayish ceramic maybe "raku" finished to mimic ancient bronze. It's 6" tall and has a rough texture with highlights of metallic copper and gold. The "Pièce de résistance" is the stopper. It's made of a 1 1/2" oval slice of a white crystal "geode". The base does have a mark but it's not very clear and a bit cryptic. Didn't find anything online like it either. Any thoughts?? -Mike-

No idea who made it but I love that

Worth asking on the Studio Pottery Collectors Group on Facebook.