77x229R mm Krupp German 1917 artillery shell

It has approximate dimensions of 77x227mm and looks Dutch to me. What is it?

Why Dutch? And how should they have made something in 1917?
This is a German 77mm field gun case.

Sorry, Alex, I found some tulips inside and got mislead :). What is HL?

HL should be for “Hauptlaboratorium”, something like “main loading station”.

I sent a link to this thread to a friend who is specialized in German pre 1919 artillery ammunition. Let’s see if he will help us.

Ok, I got the info that the “Hauptlaboratorium” was located in Ingolstadt (Bavaria).