i'm sorry but i think this question is still not answerd ,
some german producers are in a winecomunity called " verein deutscher prädikats winzer " short VDP
all the members of this comunity can give there wine for the auction (witch is every year in trier germany).
normaly (but not always) a winemaker would give his best fillings (fillings are makes with the "fuder-number" the second last of the several on label) ot the VDP-auction because he hopes to get a highter price as trying to sell it to the retailers!
this is the diffrence!