Underside marked Made In Germany - Musterschutz along with the numbers 8.50. Inside has the 0.5 L level notation. Although it can use a good cleaning after being on a cabinet shelf for decades upon decades, its in very nice condition.The flaw in this fellow is an old ding in the lid where it meets the thumbgrip attachment something tells me this was original to the manufacture of this stein (see two final images above). The handle thingy depicts an edelweiss type flower and the lid opens without issue. This is a handsome and scarce stein that would make a fine addition to your collection.
Good luck finding another any time soon! I'm not an expert on items like this, so I've included many LARGE images below for your grading needs. If you have any questions, feel free to ask.
The item "Antique 19C German SCHIERHOLZ Musterschutz Beer Stein FATHER FRIEDRICH JAHN" is in sale since Sunday, June 16, 2019. This item is in the category "Collectibles\Breweriana, Beer\Drinkware, Steins\Lidded Steins\Germany". The seller is "estatefresh" and is located in Cedar Grove, New Jersey. This item can be shipped worldwide.