Trench art soldier's peaked cap made from a WWI 18 pounder brass shell casing dated 1916, 10cm diame

WW1 18 Pounder Trench Art Shell Case With Stripes* - Sally Antiques

WWI period trench art shell casing, with pinched base marked

Trench Art Antique 1918 France WWI Brass Artillery Shell Case Vase

Original British WWI Trench Art Brass Powder Compact Circa 1914

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A piece of WWI trench art in the form of a British army Trench cap

TRENCH ART WW1

Trench Art - Militaria & Weapons - Antiques Reporter

WWI period trench art shell casing, with pinched base marked

Original British WWI Trench Art Brass Powder Compact Circa 1914

British, Dated 1903, 6 Pounder Brass Shell Case, Vase, Trench Art

Dominic Winter by Jamm Design Ltd - Issuu

Large WW1 British Brass Trench Art Officers Cap Made From German

75mm, M18 Shell casing, brass, dtd 1944

Decorative French Artillery 75mm Shell Case with Floral Motifs

Pair of WW1 British Brass Artillery Shells Dated 1917 - Country

3 inch shell case for M1902 Cannon

What do these markings tell me about this shell casing? I know