I've done a lot of requests regarding the signatures of Cuba, so here's the sources. Most of the post 60s signature photos are clear enough to be read but for the older ones sadly they're unreadable so either I have to look for other approved sourced that have better pictures and if not Maybe I'll post again down the road asking for owners of each type to photograph the signatures so it can be uploaded to each note type (if they want to).
https://www.moneypedia.de/index.php/Signatur:_Kuba
https://en.wikipedia.org/wiki/Central_Bank_of_Cuba
https://en.wikipedia.org/wiki/Ministry_of_Finance_and_Prices_(Cuba)
https://en.wikipedia.org/wiki/List_of_heads_of_state_of_Cuba
https://en.wikipedia.org/wiki/Silver_certificate_(Cuba)