Good evening, guys.
Cahuapanas was/is a steam, iron-made launch built in France in 1872. Privatelly owned, was adquired by the Navy in the early XX Century, and used as a transport in the Amazon basin, but during the short lived wars against Colombia (1932) and Ecuador (1941) was armed with a pair of 3 pounder guns. Paid off in the 1970s, once again was privatelly owned, renamed MV Clavero and modified with a diesel engine instead the reciprocating steam engine, and is currently being used as a cruiser boat, from Iquitos.
Cheers.