Germany - "Six letters of historical interest" read description

1st letter: A period letter sent from the Prussia/Germany area in the mid-19th century (circa 1850–1860). The Cancellation Stamp (Ringstempel “578”): on the stamp, there is a distinctive circular four-ring concentric stamp with the number 578 in the center. This type of ring stamp (in German, Nummern-Ringstempel) was used by the Prussian Post (Preußen) to identify the originating post office. The stamp visible under the postmark is yellow/orange, typical of Prussian issues of the era and may feature a head of King Frederick William IV of Prussia or the Prussian eagle coat of arms. The Date Stamp (Tagesstempel): At the top right there is a circular stamp bearing the inscription HAMBURG 7 / 9 8-9V (Hamburg, 7 September, time slot 8–9 a.m.). It indicates the place and moment of dispatch or transit of the correspondence.\n2nd letter: It is a postal stationery item (an envelope with the pre-printed stamp directly on the document, called Ganzsache) of 2 Silbergroschen in blue, depicting the profile of King Frederick William IV. Sent from Elberfeld (as clearly read from the rectangular postmark at the top right) and addressed to Lippspringe bei Paderborn.\n3rd letter: It is addressed to “Gebrüder Porges” (Porges Brothers). The Porges were a very important and famous family of industrialists of Jewish origin in Prague/Smíchov (especially renowned in textiles, printing of cotton, and manufacturing in Smíchov from the early 19th century). This is a splendid piece of postal history; the letter is written with a beautiful stylized nineteenth-century calligraphy and is accompanied by a stamp with wide margins from the Austrian Empire of 6 Kreuzer from 1850, the postmark is a black circular cancellation stamp typical of the period. A historically referenced letter of the great industrial families of the era in Prague.\n4th letter: This fascinating letter dating from the second half of the 19th century originates from the Austro-Hungarian Empire from the Galicia region, today divided between Poland and Ukraine. The visible stamp is an oval blue ink stamp with the German inscription: ERZHERZOGLICHE BRÄUHAUS-VERWALTUNG SAYBUSCH, the stamp meaning Administration of the Arciduchal Brewery of Saybusch (today Żywiec, in Poland). The famous Żywiec brewery was founded in 1856 by Archduke Charles Fernando of Austria-Teschen. This letter comes directly from the management offices of the historic Archducal Austrian Brewery at Saybusch. It refers to the well-known Haberfeld family and manufactory (specifically Jakób Haberfeld), a famous industrial dynasty producing spirits and liqueurs based in Oświęcim since 1804. The stamp is from the Austrian Empire, 3 Kreuzer (pink/red color, printed between 1860 and 1864, depicting the double-headed Austrian eagle or the profile of Emperor Franz Joseph). This letter represents a commercial/administrative correspondence document of the Austro-Hungarian era (circa 1860–1870) between two major economic entities of the district: the Archduke Austria Brewery at Saybusch (Żywiec) and a member of the prosperous Haberfeld industrial family in Oświęcim."