Their pieces are very desirable with Delft-ware collectors because of their high quality and accuracy of design reflecting the old masters. The initials below the triangle and to the left are those of the Artisan that actually decorated this masterpiece. On the right side and again below the triangle, is the Date cipher (letter D) of when it was made, which in this case corresponds to 1906. This is a truly fantastic and fairly rare piece and you are very lucky to have it!...
Your particular example appears to have been made by and for Royal Limoges themselves, and was exported or sold to wholesalers by the same company. It dates ca 1910s - 1930s.
ROYAL BAYREUTH MARKS ON TEXTURED JUG
In my opinion, the most likely maker is BARKER & SON ca 1850s because your item does not have the Country of Origin notation (required only after 1891). Also, its style is more of a ca mid-19thC example rather than later. As you know, this is usually referred to as FLOW-BLUE pattern and yours is exceptionally high quality and unique with all its Gilt accents and extra decorative detailing.
According to our reference resources, the majority of their items were in the "Oriental and Renaissance styles" with hand painted details and extensive use of enamels. Yours is clearly in the Oriental style and very desirable. This mark is actually included in our database under the "A" Shape category or use our NAME SEARCH for HUSSL to view it faster and read a brief Fact Sheet on the company. Stunning and unusual, you are very fortunate to have such an eclectic grandmother and even more lucky that she passed it down to you!...
Because most of their items are regarded as Metalware, you will find a reference to this mark in our Jewelry & Silver Marks Guides. In the particular case of your item, you are probably correct that this is a Ceramic piece and the overlay is this Orivit alloy, which in fact consists of 89.85% Pewter, 7.9% Antimony, 1.9% Copper, and 0.12% Silver.
In general, this company begun ca 1880s in Cologne, Germany, and created this alloy for use with decorative items in the 1890s. In early 20thC (ca 1904 or so), it run into financial difficulties and merged with another similar company called OSIRIS. Unfortunately, this was not sufficient to avoid total collapse, and both were soon acquired by WMF in 1906. Because of this, items marked with the ORIVIT logo were made during a very brief period (ca 1890s - 1906) and are very desirable with collectors. You are very lucky to have such a beautiful example!...
However, in 1935, the DESHOULIERES GROUP, who were also famous for their Cookware and related products since 1826, purchased the name APILCO from A. Pillivuyt and begun using it on products that were partly made at Chauvigny (one of their main factory locations about 50 or so miles west of Limoges) and finished and/or marketed by A. PILLIVUYT & FILS. As you know, A. PILLIVUYT & FILS, was a separate company (established in 1818 in Limoges) and produced similar wares. This particular mark was used on items made ca 1935 - 1960s, which dates your piece.
Please note that APILCO and A. PILLIVUYT items are regarded as some of the best in the industry for professional chefs. Also, "A Feu" literally means "Fired", a reference to the fact that these items were fired at a Kiln at high temperatures to achieve long lasting non-porous surfaces that can withstand demanding use, such as in a professional kitchen.
Although small, it has been professionally executed and the sponge-like effect on its surface and smooth glaze indicate an experienced Potter. Original and early Bauhaus Pottery pieces seem to be very desirable with collectors.
To use our huge database of Pottery & Porcelain marks, including marks on Ceramics of all types, please see our Ceramics Marks Identification service.
To find prices and determine values for your antiques & collectibles, including porcelain & pottery, please see our Antiques Price Guides with millions of examples of items sold at auction.