Lot 77 - Quantity of shells and shell casings to

Lot 77 - Quantity of shells and shell casings to

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Found this 20mm shell casing in my late Grandpa's house. Can anyone help decipher what's written on it? (I want to know where/when it originated). : r/Firearms

Premium 223 Rem Ammo For Sale - 77 Grain OTM MatchKing Ammunition in Stock by PMC X-TAC Match - 20 Rounds

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military - Can anyone tell me anything about the markings on these shell casings? - History Stack Exchange

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Cartridge case terminology and identification – Stephen Taylor, WW2 Relic Hunter

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