It's probably a personalised stein. What it was was detailing the 20th (Wurttemberg) Hussar Regiment of the German/Prussian Army, it says K, Wilh, probably King Wilhelm I of Prussia and Kaiser of Germany, 1 Esk ie 1st Squadron. Date is 1883.
Coat of Arms is not Wurttemberg. Bit more digging to do. Might even find an image of the uniform.
No, it's not Hussars, but Uhlans ie Lancers, goodness knows how. On the stein it looks like maroons!!! So, in 1883 20th (2nd Wurttemberg) Uhlans.