score:9
What you have is a casing from a 77mm German field artillery piece, possibly like this: Some of the stamps:
not sure yet on the G(may indicate maker Geschossfabrik), and 36 may be lot number. MΓ€rz 1917, of course, would be the date.
some sites to look:
Upvote:3
Just adding a little detail, it is MΓRZ 1917 (A with umlaut), the two dots over the A are a part of the text and not an accident.