value of German wine

[wondersofwine]

Welcome to the board Winton. If the wine is not an Auslese (made from specially selected very ripe grapes) or Beerenauslese etc., it is probably long dead. While the higher category of Germany wines can have lengthy lives (20 or 30 years), the average German wines do not go that long. I'm not even sure the wine you have is from the Riesling grape. It was probably intended to be consumed as a young wine. Also, a single bottle of wine with uncertain storage (subjected to too much heat, light, vibration or too little humidity) is hard to market.