I have heard about Argentinian 'Dinky Toys', but have never seen one.
That Argentina seaplane, though, looks to be rough copy/recasting of the pre War Mercury with some minor changes and non-Dinky propellers.
The Dinky Toy Mercury was part of the pre War Mayo Composite set, and also sold separately. After the War in 1946 it was reissued and produced until the 1950s as Seaplane. It holds the record for being in production the longest of all Dinky airplanes.

On the left the post war Seaplane. In the middle is the wooden prototype Director's Model. On the right is the pre War Mercury.

The pre War Mercury had a clip in the center of the fuselage cavity to attach it to the Maia, the post War Seaplanes did not.
Tone is right about the Dinky DH Flamingo. It was proposed pre War but not produced in England by Dinky Toy. {....and Tone was right about the book, too. It was a good mystery story.}
There was a 1980s white metal model of the Flamingo made by David Austin of the Aerodrome. It was done in the style of a Dinky Toy. 4 versions- here below is the camouflaged one. There was a Kings Aeroplane, Silver civilian registry and a silver RAF variation.

