This is a pair of pot de creme cups produced by the Rue Thiroux factory in France. The quality of these cups rival those made by the Sevres factory. If you click on the image showing the mark, you'll see it is the mark of Queen Marie -Antoinette of France. You can read more about the history of the factory below.
Each of these two cups were manufactured around 1800 and are decorated with tiny green leaves and violet colored stylized flowers surrounded by swags of gold. The body and lid of the cups are further embellished with tiny gold stars. All of the decoration of these cups were painted by hand including the extensive gold trim.
The cup finials are small rosebuds of pink and yellow with raised green leaves. The handle decor is a simple set of gold dotted lines with a solid gold line along the side.
The Rue Thiroux factory was started by Leboeuf and Barrachin in 1776. (Ulla Safford) Their original mark was registered as the letter A. Two years after that Queen Marie Antoinette gave protection (of the mark) and a crown was added, above the A, in red.
Interestingly, in 1778 the police arrived at the factory to enforce some "infringement" of the factory Sevres. It was at this point, Marie Antoinette offered protection of the factory and her crown was added to the Rue Thiroux mark. Later the factory was referred to the Queen's Factory and also, as noted by William Burton, referred to as Porcelaines a la Reine.
After the French Revolution the factory was handed over to Guy and Housel who operated it until around 1820. According to Burton, during this time some of the best porcelain was made at this factory, pieces which were almost indistinguishable from those manufactured at Sevres.