I think the image on this page is wrong as is the lettering, as it does show the "sociedad anonima" (in contrary to what the comment says)
https://en.numista.com/catalogue/note210144.html
moreover Banknote Museum says the P120A does not exist, so maybe the page should even be deleted (preferably with a comment on the P113 page)
http://www.banknote.ws/COLLECTION/countries/AME/ECU/ECU-BCE.htm#1957-1983%20Printer%20TDLR%20-%20with%20Sociedad%20Anomina%20Issue
Anyone more info? Local catalogues?
I already mailed swappers