That flag is from the Moroccan Caliphs personal flag/standard. You can actually find this fairly easily, the stamps you posted are even in Arabic, they're from the Protectorate of Morocco during the same Caliphate. The symbol wasn't so exclusively Zionist at that point in time, many other non Jєωs have used it in the past. However, Franco was surely sympathetic to Jєωs insofar as doing what he believed was the Catholic thing in following both the footsteps of Pius XII in regards to his exchanges with Jєωs. To trash on Franco for accepting and helping Jєωs during and after wwII would mean you should first trash on Pius XII, all Franco did was heed the teaching coming from the Vatican on that whole subject.
https://www.fotw.info/flags/ma_es.html
A millennium of Christendom did not allow the Jєωs to run rampant in the polity.
Sicut judaeis non prohibits wanton pogroms and extermination
and it imposes a reciprocal duty on the SS that they not subvert/destroy decent society.
Mind you, I do not argue that Franco was an utterly subservient tool of the ѕуηαgσgυє. I argue that he had some important successes, but had clay feet—made a big mistake in allowing new ѕуηαgσgυєs and political privileges to the SS. Franco did not intervene to suppress the modernist error of "freedom of religion."