All these 2, 3, and 5 mark coins from 1888 to 1913 have King Otto on the 'heads' side and the German imperial eagle on the 'tails' side, although the eagle design varies slightly from year to year.
Here are some details for these beautiful coins. Values are for all dates and mint marks, unless called out separately
FUNF (5) MARK: 37 mm diameter, 0.804 Troy ounces silver
worn: $20 to $30 US dollars catalog value
average circulated: $50 to $100
well preserved (like the picture): $150 to $200
fully uncirculated: $250 to $400
1888D $500 in average circulated condition
1896D $250 average circulated
1906D $150 average circulated
DREI (3) MARK: 34 mm diameter, 0.482 Troy ounces silver
worn: $15 US dollars catalog value
average circulated: $25
well preserved (like the picture): $35
fully uncirculated: $80
ZWEI (2) MARK: 28 mm diameter, 0.322 Troy ounces silver
worn: $10 US dollars catalog value
average circulated: $30
well preserved (like the picture): $55
fully uncirculated: $100 to $200
1888 $300 in average circulated condition
1898D $110 in average circulated condition
1913D $80 average circulated
Be sure you understand what 'catalog value' means. It is defined in detail on our Terminology page.
The value can't go lower than the basic value of silver. Look up the value on web sites such as Kitco.com.
The second picture shows the reverse side of a drei mark with natural rainbow toning. The vivid colors are very attractive to some collectors, and very repulsive to other collectors. All told, toned coins are worth less than 'white' silver coins unless you can find a toning freak who will pay extra for toned coins. Me? Personally? I like toned coins. It makes them extra interesting.
DO NOT CLEAN YOUR COINS. CLEANING RUINS VALUE.