Vintage Bullmouth Helmet Shell Ashtray order

I purchased this natural shell ashtray on a recent buying trip abroad in Brussels. This was cut from a Bullmouth Helmet shell and measures 6 3/4" wide x 5"deep. Ashtray has a silver metal cigarette holder affixed near the bowl. This type of shell is where most cameos are cut out and carved from as there are multi layers of translucency.

Third photo shows a different shell of this species that I have (also for sale but not listed yet) showing a order cameo cut into the top. These are often used in the cameo shops in Italy to show customers where cameos come from. Just a little trivia about this type of shell!