Now that's a nice coin! The thick rim and beautiful design is something you rarely see these days.
The old German State of Prussia, as part of the German Empire, issued these coins in 1910 to commemorate the 100th anniversary of the University of Berlin (Universität Berlin), which was founded in, you guessed it, 1810.
These are big, hefty coins, and they are made of silver. This gives them a base silver value. A coin worn down to a frazzle, or a coin with major damage such as holes, gouges or mutilation, will only be worth this base silver value. At 0.4823 troy ounces of silver per coin, and a current silver value of around $23 US dollars per troy ounce, each coin has just about $11 of silver in it.
Now, any coin with decent eye appeal will be worth more than this, as outlined in the approximate catalog values provided below.
worn: $15 US dollars approximate catalog value
average circulated: $55
well preserved: $85
fully uncirculated: $125
There is a 3 mark coin which looks very similar with the date 1911. The 1911 coin is a tad less valuable than the 1910.
Our image comes from a neat blog titled Coin of the World, and CoinQuest thanks them for use of their image. It is a nice one.
Remember that these are catalog values, and must be adjusted as such according to the 'Important Terminology' page found at the top left.
Some research reveals that just barely uncirculated specimens of these coins with beautiful eye appeal have sold in the past for around $70 on eBay and similar sites.