Can anyone tell me what the markings on the bottom of this shell casing mean? (My thumb is covering a business logo) : r/MilitaryHistory

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I have a bullet that has S.L. 43 on the bottom of it. Is this

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Markings on bottom of shell casing : r/MilitaryHistory

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What do these markings tell me about this shell casing? I know it's a 25 Pounder from 1942, but that's about it. : r/Militariacollecting

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Well made Brass Polte Magdeburg 1915 Trench Art shell, York and Lancaster Hat