Your piece comes from the Jean Pouyat family one of the oldest names connected with the Limoges porcelain industry. Beginning ca. 1760s
The mark places this Ca. 1890 - 1932 It is hand painted The artist signature on the side is Emile & noted as such in my reference books. ( Possibly Emile Pouyat) This would have come with a Tankard & mugs to match Like the attached photo. I would place a value for your single mug approx. $30.00 - $70.00 of course if someone had the tankard & needed more mugs to complete their set it could go for more.