Margot de taxco brooch

[Mnich22]

So I really messed up my first attempt at posting and so am starting over with the hopes an admin will delete the previous thread as I can’t figure out how. I purchased this brooch for not a lot as a gift. Would love to know if it’s actually Margot de Taxco as that is what it was sold as. Some of the marking seems right, but unsure of the name. Also would love to know if the 5777 design number, which does seem to match with her silver and enamel pieces is from a particular as I cant find info on it. I did find what looked like this exact brooch on a google search but it was a sold item and there was no pictures of the back to compare to. Would be nice before I give it for Christmas to know more about it