The Latécoère 28 (aka Laté 28) is the aircraft from the Latécoère firm which Mermoz used to cross the South Atlantic ocean for the first time on May 12, 1930.
It was made famous by its use in postal links between France and South America in the service of Aeropostale, in the 1930s.
It was a single-engine airplane, high-wing capable of carrying 8 passengers. It was built in 50 copies from 1927 to 1932 and its original Renault engine was replaced by a Hispano-Suiza more powerful.
The seaplane is the version that was used at the crossing of the South Atlantic ocean.
Latécoère 28 on Wikipedia