It's hard to tell since there is no image of this mark with your entry. However, if it also has a small flower (looks like a 4-leaf clover) and reads GES. GESCHUTZT below "ELSA", then it was most likely made
MERKELSGRUN PORCELAIN FACTORY (Merkelsgrun, Bohemia - now Merklin, Czech Republic). This mark was in use ca 1912 - ca 1917.
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