Brass shell casing - 1917 - General Ammunition Discussion

I have a brass shell casing that came from my grandfather’s home in Toronto that has been used as an umbrella stand for at least 50 years. I is 5.5 inches wide at the top (14 cms) and about 28 inches long with a rim. It says “37 /Polte /Magdeburg /Sp406” and Sept 1917. My grandfather was in the Royal Canadian Artillery through most of World War I Please tell me what I’ve got. It makes a good umbrella stand. Does it have any historical value? My wife want to have it lacquered becau

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