Answer:
1950 was the first year that coins were struck by the newly-formed Federal Republic of Germany (Bundesrepublik Deutschland).
Rhat means coins from 1950 are quite common among collectors, so they don't carry a lot of extra value.sammler.com, a major German collectibles site, lists the following approximate retail values as of 04/2012:
"D" mint mark (München [Munich]):
Slightly worn - US$2.60
Almost no wear - US$13.00
Uncirculated - US$32.50
"F" (Stuttgart):
Slightly worn - $2.60
Almost no wear - $13.00
Uncirculated - $32.50
"G" (Karlsruhe):
Slightly worn - $2.60
Almost no wear - $13.00
Uncirculated - $32.50
"J" (Hamburg):
Slightly worn - $2.60
Almost no wear - $13.00
Uncirculated - $32.50
If the coin shows substantial wear it may only be worth a dollar or so.