I am sorry to say that there is nothing odd or obscure about this two lines
Altaya has been distributing models of aircraft (fighters, helicopters, bombers, military transports, floatplanes) for many years in several European and South American countries. Under their bomber series they released 60 models in 1/144th scale, including several float planes: Catalina, Sunderland, Mavis, Emily, Coronado, Mariner, BV-222, Do-24, He-115 and Cant Z-506B.
Amercom, a Polish distributor, released the same aircraft (different models) with a somewhat smaller metal content. Some (the larger ones) in 1/200th scale.
Some of these models are available in the US at some of the larger web sellers, such as Diecast Direct and the Flying Mule.
https://www.diecastdirect.com/asp_modul ... de=AC-LB31http://www.flyingmule.com/products/AM-ACLB31