The A mint mark (Berlin) is the most common one for this date. sammler.com, a major German collectibles site, quotes a retail value of at most €0.50 (about 75c) for a coin in average circulated condition.
The 1979 German 2 Pfennig is worth about 2 dollars depending on its condition. Some of these coins can be more valuable including the 5 Pfennig coin.
About 5 dollars
1 zinc pfennig $2 to $5 5 zinc pfennig $3 to $6 10 zinc pfennig $5 to $15 1 copper pfennig $4 to $8 2 copper pfennig $5 to $15 50 aluminum pfennig $15 to $35 5 & 10 brass pfennig $25 2 & 5 silver reichsmark $5 to $10 above spot
1 zinc pfennig $2 to $5 5 zinc pfennig $3 to $6 10 zinc pfennig $5 to $15 1 copper pfennig $4 to $8 2 copper pfennig $5 to $15 50 aluminum pfennig $15 to $35 5 & 10 brass pfennig $25 2 & 5 silver reichsmark $5 to $10 above spot
One pfennig was to the German mark the way one cent is to the dollar. It's a common coin, worth maybe 10 cents.
Money
The range is from $1-$2 USD depending on its condition.
1 zinc pfennig $2 to $5 5 zinc pfennig $3 to $6 10 zinc pfennig $5 to $15 1 copper pfennig $4 to $8 2 copper pfennig $5 to $15 50 aluminum pfennig $15 to $35 5 & 10 brass pfennig $25 2 & 5 silver reichsmark $5 to $10 above spot
Not enough information. Please post a new question with the coin's denomination. It will be either in pfennige ("pennies") or marks. 1 zinc pfennig $2 to $5 5 zinc pfennig $3 to $6 10 zinc pfennig $5 to $15 1 copper pfennig $4 to $8 2 copper pfennig $5 to $15 50 aluminum pfennig $15 to $35 5 & 10 brass pfennig $25 2 & 5 silver reichsmark $5 to $10 above spot
it could range from $ 20 to 100 us , depending on the mint mark and quality .
1 zinc pfennig $2 to $5 5 zinc pfennig $3 to $6 10 zinc pfennig $5 to $15 1 copper pfennig $4 to $8 2 copper pfennig $5 to $15 50 aluminum pfennig $15 to $35 5 & 10 brass pfennig $25 2 & 5 silver reichsmark $5 to $10 above spot
1937 is a common date for Lincoln cents. If circulated, it's worth about 2 cents. A nice uncirculated coin is worth about 50 cents.