In the 1878 "Globe Encyclopedia," the Trubia cannon foundry was said to have been established in 1844, but the "Encyclopaedia Londinensis" of 1829 stated the town already had a cannon foundry:
The Globe Encyclopedia of Universal information ..., vol. 4, (1878) p. 523: "12 miles W. of O[viedo]., at the confluence of the Nalon and Trubia, is the royal iron foundry and manufactory of Trubia (established 1844), employing 1200 men, and annually producing 365 cannon of 3 to 44 tons' weight, besides 12,000 rifles and carbines, as many bayonets, 900 revolvers, and 36,000 files. Pop. 14,156."

Encyclopaedia Londinensis, or, Universal Dictionary of arts ..., vol. 24, (1829) p. 125: "TRUBIA, a small town in the north of Spain, in the Asturias. It stands on a river called also Trubia, and has a cannon foundry."

The following is a report on what the Trubia foundry exhibited in London in 1862:
Annual of Scientific Discovery: or, Year-Book of Facts in Science and Art for 1863. p. 30: "Spain, like Italy, has adopted the French system of rifling in her artillery, namely, that of Treuille de Beaulieu, and sent several specimens to the Exhibition. The royal foundry of Trubia produces all the steel and iron, both wrought and cast, required for the use of the Spanish service. This foundry exhibited, as a specimen of the rifled iron ordnance now adopted in the Spanish service, a gun of cast iron, strengthened with bands of steel, and rifled after the French model, about 10 feet 9 inches in length, and weighing about 8 cwt., the diameter of the bore being 16 centimetres (6 ¼ inches)."

Where is this Trubia cannon located today? It's a muzzle-loader I presume? Field-gun sized?

John