Value

[Barrick]

I have a case of Glasscock Vineyards Chenin Blanc. The case has not been opened and the date of bottling is on the case. The date is March 7,1981. The vintage on the label is 1982. The bottles have been stored cork down.The wine has not exposed to sunlight or too any extreme temperatures.
Glasscock Vineyard was located in Jeff Davis County, Texas. My understanding Glasscock is the first vineyard to go bankrupt since prohibition.
Could someone supply me with an estimated value?