lol you guys are crazy!
the hole is on the top of the ashtray. my best guess is that, originally, a metal rod fit into the hole with a loop fitting down inside the edge of the bowl and a cigarette rest attached to the bottom of the loop (yes, I have a good imagination). Any thoughts on that theory? Has anyone ever seen a Murano piece with metal cigarette rests?
p.s. now I can't get the image of fitting a glass straw into that hole out of my head... what a big pipe you have grandma... sheesh!