Macchi M.7 & M.7ter

The Macchi M.7 was an Italian flying boat fighter that was designed both by Alesandro Tonini and manufactured by Macchi. It was similar in most aspects to the earlier M.5 but it featured an slightly modified hull and it was powered by an Isotta Fraschini V6 engine. The first airplane rolled out from the factory in mid-1918, so, due to the end of the World War I only 17 of them served with the Italian Navy.
As the war ended and they had a surplus of airplanes, they sold two to Argentina (who re-sold their ones to Paraguay), other two to Sweden in 1919 and some years later, in 1921 Brazil bought three of them.
In 1920 a new racing version, named M.7bis was designed, featuring a lighter structure and a smaller span-wings. It came foruth at the 1922 Schneider trophy that was hold in Naples.
There was also a third version, the M.7ter which featured a redesigned strengthned hull, a better wing configuration and a new tail. As it was thought to be an airplane designed to operate from seaplane tenders (in fact, it operated from the Giuseppe Miraglia seaplane tender) a version with foldable wings, named M.7terAR was built. It became the standard Italian flying boat fighter during the 1920s as, in 1924 six Italian naval squadrons were equipped with them and more of 100 of them were built, some of them serving until the early 1940s in private flying schools.

Sources:
1. https://en.wikipedia.org/wiki/Macchi_M.7
2. Salamander Books - The Complete Book of Fighters