Czech or Slovak citizenship

My grandfather was the chief rabbi of Jerusalem in the 20-30s. (The reason for this was, to the best of my knowledge, that he hosted the President of Chaskolbukia (Masaryk) and that the President had decided to grant him honorary citizenship, and that citizenship of honor would be granted to all his descendants and future generations.

As far as I know, this honorary citizenship was even used to produce a passport, whether in the name of my great-grandfather or one of his descendants (I do not know exactly who is using it, but I know that a passport was produced, and as far as I know it was my grandfather's grandfather).

Now we want to examine our eligibility for citizenship - whether Czech or Slovak.

Can anyone help?

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