Hi Ritchie,
Nice to see another Brazil collectors out there. From my understanding, the timeline of the base labeling is something like this:
From about 1965/66, Roly Toys only imported Lesney models assembled at the factory. These were resold in Brazil, often with import labels applied to the BOXES. These models are otherwise identical to Lesney.
In about late 1972/early 73, Roly Toys began importing unassembled castings pieces from Lesney. Rumor is this was for more favorable taxation from the gov't to promote assembly jobs in Brazil. These models were often affixed with a Roly Toys black label and are some of the rarest pieces. It is debatable if trial assembly of models occurred before this.
In about 1975, production moved to Manaus and the company name changed to Inbrima. The early Inbrima models were often affixed with Inbrima black labels. Model body and base castings during this production time seemed to variably issued pre-painted or unpainted (I suspect it is whatever the factory had lying around). Models after this point often had the words "Made in England" etched form the baseplate.
In 1976 a small number of models were issued with gold foil Inbrima labels.
After that the company transitioned to using mostly plastic tab bases. At that time, it appears some models were also issued with the Manaus stamped base I pictured above.
Toward the end of production (late 1970’s/early 80’s). They started affixing large white labels (similar to the one on the 20A you pictured). The early black Inbrima labels also started being used again on a small number of models.
With your models, I really like that Alfa Carbo, that is a very rare early piece with a genuine label. Roly labels are rare to find on anything. I think that green Lamborghini is not a genuine model. That large white label appears to be a reproduction to me. These large labels were not used until about 1979 and this casting is much earlier. I will post a photo of a genuine large white label below. The gold label on the Wildlife truck is quite rare and only issued in 1976. The other models you pictured look beautiful!
Trol seemed to take over production in the early 1980’s. It is my understanding these models were exported worldwide to collector markets and are much more common than the models only issued in Brazil.
Hope this helps. Do you have any additional information you have discovered?
David
(edited for typos and etching time)