Thank you for your thoughts and explanation.
With all due respect, the only thing that makes this necklace "art deco" is the use of geometric plaques, and those are definitely not fashioned by hand. They are obviously machine made. The use of hand soldering (somewhat sloppy) on the chain is not evidence of 100 year old origin.
I certainly had googled art deco Mexico jewelry, and I saw absolutely nothing that even comes close to looking like this necklace. The women in Mexico were not wearing "art deco" clothing...the country itself was far removed from the deco influence, except for some architecture.
The closest that I can reconcile myself to art deco in Mexico is the Frida Kahlo times. If you google her, you will not see any comparison. And, of course, the Spratling era, when Mexican jewelry came into its own.
I have been handling jewelry for the better part of 40 years, and I have my own instincts, as you do. I have seen more than an ample share of mismarked Mexican jewelry. In fact, I believe that this sad fact has taken away the desirability of Mexican silver jewelry.
The necklace is interesting in itself, but it, to me, is not art deco anything. If you believe that it is, well, that's great! I think that it is just another interesting piece that is nice to look at, but nothing special at all. Just like fashion jewelry.
It is actually not doing anyone a service to speak so definitively of the age of this piece when there is nothing in the way of provenance, and just a best guess as to the time frame.
