I found this ashtray from the Carson City Nugget. Questions... #1 What's the shape called? "Rounded Triangular"? #2 Is the image on the bottom of these trays a decal or is it silk screened? Looks like a decal, but I'm not sure. #3 Do the grooves for holding the cigarettes have a name? #4 On the bottom, directly under each groove, is a small bump in the glass (as made), that hold the image off the table. Is this unusual? #5 Value?

Thanks for the help!