It says Kursaal in Wiesbaden, the Kursaal being the central hall for the spa - which was normally used for concerts.
I would put the date considerably later, say last quarter of the 19th century.
It is a souvenir from Wiesbaden, but not necessarily a spa cup. Spa cups have a level inducation, sometimes only mililiters, sometimes day doses. People going for a "kur" (as most elderly Germans still do, every 2 years, paid for by the insurance!) would slowly build up their intake of water over a 10 day period - marked on the cup.