I've been adding Cuban stamps to my database and although, in my opinion, some of the early engravings lack the quality of ABNCo or De La Rue, there are some fine stamps among them.
Unfortunately, my main catalogue, Stanley Gibbons, has very few details on the
engravers and designers. Here are a few.

SG339 Scott 320 Dr. Carlos J. Finlay. Engraved
by the Security Bank Note Company, Philadelphia and printed
by Cia Nacional de Artes Graficos.
Up until the time that Cuba became a socialist state, one printing company produced most of the Cuban stamps. This company changed hands several times and each time, the name was also changed. The company names were: J.L.Rodriguez, Cia Nacionalde Artes Graficos, Cia Impresora de Cuba and P. Fernandez y Cia, Havana.

Calixto Garcia on horseback. SG435 Scott 360. Details as above.

SH454 Scott 371. The tree of Fraternity in Havana from the set celebrating American democracy. The printer and
engraver as above and the designer is given as Cabrera and Cuesta which I assume is a design company.
There are very few individual
engravers or designers accredited in the catalogue.