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.