Colored stemware (Maastricht Carnaval from Holland, c. 1956-1961)

This is a stemware collection consisting of 54 pieces (actually 53, as one green tumbler is missing). There are 6 different colors, each with 9 pieces. My father had them shipped over from France when he was in the army between late 1958-early 1961. I do not know where specifically the collection is from, nor do I know the maker. I also don't know what all the different pieces were used for! Any/all assistance is appreciated. They are just beautiful. A few pieces have very small chips/cracks, but overall they are in excellent condition. (I edited the title to reflect the solving of the mystery. See my comment below.)