1 DM (deutsche Mark) = ca. 0.48 € (Euro)
That really depends on the year the coin was minted and the condition of the coin.
That may refer to "Deutsche Mark", the money used in Germany before they switched to the Euro.
The Deutsche Mark ended on January 1, 2002, when it was replaced by the euro as the official currency of Germany. The decision to adopt the euro was made as part of the European Union's plan for economic and monetary integration.
Not much, the coin you're describing is a 2 Mark coin, of which millions were in circulation. Unless it is in "mint uncirculated" condition, its value is purely as a curiosity, since the Deutsche Mark was replaced by the Euro.
If your question relates to the numismatic value of a 1978 Deutsche Mark coin, it is worth less than a dollar in circulated condition, and US$1 to US$2 in uncirculated or proof condition. This is the case regardless of which mintmark (D,F,G or J) you are referring to. If your question relates to the Dollar-Deutsche Mark exchange rate in 1978, US$1.00 = DM2.00 (FYI, it was US$1.00 = DM2.32 in 1977 and US$1.00 = DM1.83 in 1979).
The currency of Germany before the Euro was introduced in 2002 was the Deutsche Mark, or Mark for short.
It is worth 1 cent.
The Deutsche Mark is a former currency of Germany that was in circulation until it was replaced by the Euro in 2002. There is no intrinsic silver value in the Deutsche Mark as it was a fiat currency, not backed by silver or any other precious metal.
All circulation-strike 1 DM coins issued by Germany after WWII are made of copper-nickel.
That really depends on the year the coin was minted and the condition of the coin.
50-150 or so
75-260 or so