Noob Needs Help

[drmath19]

I was involved in an estate auction last week and purchased a lot that included an artillery shell vase. I am newborn to the world of artillery and have spent much time on the net trying to learn more about the piece that I acquired with little success. Any help that the veterans would be willing to provide would be appreciated. The shell stands 7 13/16" high, the rim is 3 1/2" across and the base is 3 3/8" across. Please see attachments.

Thanks for any help that can be provided.

 

[Slick]

Appears to be 75MM. French. WW1 vintage. Somebody here will be giving more detailed, and sure, answers.
Commonly referred to as trench art.