~ Hast du Kater, ist mein Rath ~
There's a little poetic license in this verse and I've probably tried it, but couldn't tell you if it indeed works. Kater (cat) is the symbol for a hangover. The stein is marked with the Merkelbach & Wick logo and probably dates to the 1870's because there is no capacity mark on it. Metric system capacity marks were not adopted in Germany until about 1875 and it took a few years to comply.
Hast du Kater, ist mein Rath:
Trinke früh was du trankst spat.
(When) you have a hangover, my rule is:
Drink early what you drank last night.

This same verse can be found below on a Marzi & Remy stein, mold #435, ca. 1900.

This same verse can also be found below on the etched stein marked with the Villeroy & Boch - Mettlach logo and form number 1976,ca. 1900.
Translation: Les Hopper compilation/Roy De Selms
Photo credits: Unknown, unknown, Andre Ammelounx - The Stein Auction Co