Hi Heide,

Thank you for contacting Mearto with your appraisal inquiry.
The cups in this service are regular coffee cups rather than demitasse cups, which are much smaller. In light of this, and because the set includes plates, it is more appropriate to call this a dessert service rather than a demitasse service.
Fürstenberg pottery typically brings about $3-5 per piece when sold at auction but because you service is intact and retains the same number of place settings, it warrants a slightly higher value
Based on the photos and information provided, and subject to examination, this is:

A vintage 21-piece Fürstenberg painted and parcel gilt porcelain dessert service
made in the West Germany, 1960-70
Comprising coffee pot, 6 cups with 6 saucers, 6 dessert plates, sugar bowl and cream pitcher, marked to the underside.
Coffee pot approximately 8 inches high; plate 6-1/4 inches diameter
CONDITION: This service appears to be in good condition
PROVENANCE: Inherited
$75-125 for the set*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto.
~ Delia