This was an ordinary circulation coin in Germany until they switched to euros in 2002. At that time it was worth about 50 cents.
300.00
This was a common circulation coin until 2002 when France switched to the euro. It was worth about $1.40 at the time.
The 1971 Eisenhower proof dollar is valued from about $10 to $65 depending upon the quality of the coin.
There can't be such a coin because "S" is the mint mark, indicating the coin was made in San Francisco.San Francisco struck cents for circulation from 1968 to 1974 so a 1971-S cent is a regular issue. Unless it's in brand-new condition it has no extra value.
Please check the denomination of the coin. A 1971 One Dollar coin is an EISENHOWER dollar not a JFK dollar. Kennedy is only on Half Dollars. No matter what coin it actually is, both are just face value.
5DM was the only German monetary unit that was issued as both a note and a coin. Your question does not say which you are asking about. It was standard circulation, so unless it is in "brilliant uncirculated" condition or has a flaw it will have little intrinsic value.
$50
On this coin, the mint mark is located in between the two middle numbers of the date, and slightly above. If there is no mark in this location, the coin was minted a Philadelphia.
$1 to $4500 depending upon the mint mark and the condition of the coin.
5 cents regardless of mint mark, unless it's a proof or uncirculated coin. It that case it might retail for 25 to 50 cents.The coin is still found in circulation and is face value.
Assuming the coin is circulated and has no "S" mint mark retail value are $312.00-$492.00 depending on the grade of the coin.
The value of any coin is determined, in part, by the date on the coin, the mint mark of the coin and the condition of the coin. These three bits of information are required to establish value.