I collect so much stuff that I'm decent at all but not an expert at any!. With that said, can anybody help with the rarity and or value of this old galvanized Conoco 55 gallon drum. It is a Continental Oil Co. that I found at an estate sale and couldn't pass it up! Any guess as to the 4-17 meaning or the other lettering? April, 1917? Any help would be appreciated. Thanks!

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Continental 55 Gallon Oil Drum

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Top of oil drum