I find when looking up these glasses, that the history of the period often give interesting info on tourism to the area:
This from wiki:
'On 1 January 1818, Rüdesheim received town rights. After Prussia annexed the Duchy of Nassau in 1867 and divided the area into districts (Kreise), Rüdesheim became a district seat in the newly founded Rheingaukreis. It held this status 110 years until 1977, when in the course of municipal reform in Hesse the districts of the Rheingaukreis and the Untertaunuskreis were merged into the new Rheingau-Taunus-Kreis, and Rüdesheim had to yield the district seat to Bad Schwalbach.
In 1877, the first foundation stone was laid for the Niederwalddenkmal, a patriotic monument above the vineyards which would be finished in 1883. It attracted many tourists who could reach it on a cog railway. Today, a gondola lift brings visitors up to the monument. Tourism has more and more replaced shipping as a source of income.'
And on yours - enough for it to have been a prime tourist spot

:
from wiki:
'In 1716, Konstantin von Buttlar, Prince-Abbot of Fulda, bought the estate from Lothar Franz von Schönborn, started construction of the baroque palace, and, in 1720, planted Riesling vines, making it the oldest Riesling vineyard in the world.[1] The estate changed hands several times during the Napoleonic Wars, but in 1816 Francis II, Holy Roman Emperor, gave it to the great Austrian statesman Prince von Metternich.'
what it looked like from an engraving around 1832:
https://en.wikipedia.org/wiki/Schloss_Johannisberg#/media/File:Tombleson_Johannisberg.jpg