Other than a bottle collector, most average people seeing it on a shelf wouldn't even realize it was broken (don't know what category you'd fall into). It certainly doesn't look like a jagged break like most do. If you do decide to repair/sell, just make sure to disclose that it's been worked...
The pattern would support 24 bottles. Odd way of doing it, but I like the way it makes sense.
A mold, and the equipment needed, to make this... would have been pretty expensive, so unless the mold broke early (It does happen), there probably would be a lot more around.
Welcome to the site BTW.
Ha, missed your comments between the pics.
So the sulphide (sulfide) is pretty delicate compared to the glass and will probably turn to powder before you get it out.
I've got one on my mantle beside a picture of my old dog. not much better condition but fitting nonetheless.
And I would...