Featured Glass vase, pontil stamped with a "shell" shape

Any leads on maker or company who would have made this? Pontil is stamped with a shell-like shape. I'm keeping it for my own use, just curious. It appears to be hand done. I thought the clear was interesting with the color mixed in.

Sorry the price label is still on there! Thanks.

 

Pretty ! Im guessing newer Chinese. They've gotten very clever ,they are even polishing bases ! Plus the tickness of the glass makes me think more production,but Im often wrong.

 

That may just be a tool mark.

 

Think the 'shell' is just where the excess glass (I know there's a name for this bit...?) was twisted off.

 

Would this be called Spinach in color?