This is a French Limoges hard paste porcelain tankard. The maker is William Guerin. The artist's signature is "Worth." The date is the first part of the 20th century, circa 1900 to 1932.
The tankard is really large, 14 ¾" high and 6 ¼" wide at the bottom.
Guerin produced many of these tankards in whiteware for export to the United States to be decorated primarily by artists within decorating studios. The decorating themes were 1) grapes, 2) flowers, or 3) monks and friars.
The theme of this hand painted piece is a monk sitting at a table with a pewter mug in front of him. As you can see in the photos, the painting is of high quality; the artist was so good the painting looks like real life. The painting is on the front-right. The artist's signature is below the table.
The rest of the tankard is shaded in brown. The inside is glazed white. The blank has a raised design in a wide border around the bottom, matching the raised designs in the handle. There is a wide band of gold around the bottom and the mouth is trimmed in gold.
You can view more of these tankards in Mary Frank Gaston's book "Collector's Encyclopedia of Limoges Porcelain Third Edition" on pages 139 to 140 and again on pages 145 to 146.
There are no nicks, chips, cracks or crazing. There is a modest amount of rubbing wear to the gold trim.
The green underglaze maker's mark is WG & Cie with Limoges above and France below.
In my shop you will see quite a few items relating to wine, vineyards, breweries and hops. It is because I live in the hills of the Oregon wine country, and all sorts of related antiques bubble up from the estates linked to the wine and beer industries.