Any info on the markings on this artillery shell? : r/ammo

Shell (projectile) - Wikipedia

Anyone able to tell me what the markings on the bottom of this artillery shell mean? (I'm guessing that's what it is) : r/Military

What Do the Markings on an Artillery Shell Mean? - Our Pastimes

Large calibre markings (The Western Front Museum)

What do the numbers on the bottom of a bullet mean? - Quora

U.S. Reaches Deep Into Its Global Ammunition Stockpiles to Help Ukraine - WSJ

1939-45 Collectibles Ammunition - Russian 76,2 x 385R HE round for 76,2mm Regimental gun M1902/30, captured by Germans and with german markings on case; 7,62cm Sprgr Patr 284 (r) for 7.62 cm FK 295/1(r)

Artillery shell cases, fuzes, primers and tubes. – Stephen Taylor, WW2 Relic Hunter

303 British - Wikipedia

WW2 British Artillery Shells and Mortars – Colours and Markings – Stephen Taylor, WW2 Relic Hunter