Nachtmann Traube Cut to Clear 4 Crystal Wine Goblet Glass

I have four matching cut crystal wine goblets. The set inclused one glass of each color, Emerald, Yellow, Amethyst & Cobalt. They are 8 1/4 " High. They are in perfect condition. No chips, cracks or dings. I'm wanting to sale these. When I bought them, I was told they are Vinatge Nachtmann Traube Cut to Clear Yellow Amethyst Emerald Crystal Wine Goblets. Any help is greatly appreciated. What is a good sale price? Thank you!