The crackling which is caused by shrinkage during firing and here it must have been intentionally used as it only appears where shape are wanted and not in other parts with same colouring.
(1907 advert and reference)
CRISTALLERIES D’ULLRICHSTHAL, Maison fondée en 1830
CLEMENS RASCH & Fils, ŕ Ullrichsthal (Bohęme)
Articles d’Éclairage, de Luxe & de Fantaisie
en toutes couleurs, unis, décorés, taillés ou gravés, etc.
Représentant: E. J. CHARPENTIER, 82, Rue d’Hauteville, PARIS
Perhaps that their main product were Crystal and lighting related.
In 1878 they were also listed in Meistersdorf - A new style of frosted pink vases on an opal inner coat, ground in parts to show the opal coating, and engraved upon the pink outer coat. This style is said to have been recently patented.
However Ullrichstal and Meistersdorf were neighbouring towns and the Josef Müller refinery (Muller & Friederich) is listed as Ullrichstal-Meistersdorf. Was he the same person as Dr. J. H. Muller, who worked with Chance Bros from 1940-49, dates would fit if he was Jewish.
Note another crystal maker in Ullrichstal = Muller (Hermann), Ulrichsthal, bei Steinschönau. Which could simply be another company name at the same glassworks.
From elsewhere. A Glasrabrik Ullrichstal appears on a postcard dated 1936. So perhaps they made your entire piece.
Meistersdorf had a glassworks in 1820 and 13 refineries in 1842 by 1900 most of the population were German working in the glass industry, makers, decorators and merchants. 7% Czech in 1930.
Major families Heller, Hegenbarth, Schlegel, Fritsch, Gürtler, Fiedler, Hackel, Mahnel, Müller, Werne.
Ullrichsthal was established in 1764 today it is named Nový Oldřichov. About 60% of its workers were glass painters or cutters, the rest in transport or agriculture.
Most of the Germans were expelled after 1945 but the best glassworkers were kept.
Gives you some pointers I hope. To save reinventing the wheel you could contact relevant researchers here:http://www.olypen.com/tinkers/steinschonau/Researchers.htm
Steinschonau was in the same area. Glass school established c1880. Area towns are
Meistersdorf, Nieder-Preschkau, Ober-Preschkau, Parchen, Steinschönau, Ullrichsthal.
Glass was the main industry in this area by 1800 (started in 1600s) with 75% of the population involved. Finishers and Makers were separated and until well after 1800 most of the glassmaking was done in the forest, relocating as forest was cleared. Which is one reason that finding individuals is tough. But it was dominated by about 60 families so lots of names repeat from branches of the same family doing similar work.
Some excellent background reading: A July Holiday in Saxony, Bohemia, and Silesia by Walter White http://www.gutenberg.org/ebooks/42539