In Need of help identifying Hecho En Mexico Ring

[harmony2016]

Hello,
I have a vintage Ring that is in the shape of a snake. It is not marked sterling, but I think that it may be. It also has a green stone (?) on the top of it's head. The Ring is marked Hecho En Mex ARC (?) and also has the Eagle Marking with either an M or a 3 inside of it. Is it an early taxco ring, and what do the intitals ARC mean? Thank you in advance for any help.

[AG2012]

Hi,
Welcome to the forum.
It appears to be Mexican ``Eagle`` mark.
See here:
http://www.925-1000.com/mexican_marks.html
It`s a guarantee for sterling. There cannot be any letter but a number (e.g. number ``3``was assigned to Taxco, several numbers were assigned to makers). Try to inspect it carefully comparing with ``eagle`` mark in the link. As for the maker, it`s really difficult to identify them even with exact initials.
Best wishes

[harmony2016]

Hello,
Thank you for your quick response and answers. I have seen that Margot de Taxco made some beautiful snake shaped rings. I don't see a 16 anywhere in the ring though.
I was wondering if the marking was indeed an M or a sideways 3. Thank you for clarifying that.
Thanks again