I had to do a little searching and I will continue to do so, because there's not much I can say except that they were done as you mentioned, at Herbatte, one of the divisions of VSL at that time in the department of Namur. The black examples are made of hyalite glass, the red one is blown in a mould, both imitating Chinese laquer ware, which would be correct for its time in the Japonism period.
I have some images of the pieces from your link, that are a bit more clear, but I just need to find out if I can post them here, re copyright, to see for everybody's benefit, if not I'll send them via MP to you.
You do not mention size, but as you mentioned, the gilding would wear off quickly but I'm sure it wouldn't be for every day use. If it's a bit larger, then it could be the handle of a carving knife, which you would use even less, I guess, once a year at Christmas and very special occasions.
Coincidentally, I got approached by the curator of the Grand Curtius, mr Phillippart, earlier this week and if it is ok with you, I'll show him your pictures to see what he can find out.