This is on the bottom of a porcelain figure lamp. https://imgur.com/gallery/X1T9Lel
Porcelain factory of [b]E.&A. Müller[/b], please see [url=https://www.porcelainmarksandmore.com/germany/thuringia/schwarza-01/index.php]https://www.porcelainmarksandmore.com/germany/thuringia/schwarza-01/index.php[/url]