RARE Car Ashtray~Houzex glass~Insulator~Houze~Slag Ash Tray

We have purchased this car ashtray and are looking for a little more information on it. If anyone out there has some we would really appreciate knowing more about this particular one. We have collected quite a few of these Slag ashtrays to put in are automotive museum, but this one is very rare and unique. This one has the Flower on it as shown in pictures. We have looked at quite a few collections and can not find any like this one. Thanks for any help!