QF 13 Pounder 6 Cwt AA Gun
The Ordnance QF 13 pounder Mk III anti-aircraft gun, also known as 13 pounder 6 cwt, was an early British improvisation in World War I to adapt the 13 pounder field gun to anti-aircraft use. 6 cwt referred to the weight of barrel and breech (6 x 112 lb = 672 lb) to differentiate it from other "13 pounder" guns.
Read more about QF 13 Pounder 6 Cwt AA Gun: History, Combat Use, Performance
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—Rutherford Birchard Hayes (1822–1893)