help with Mex. hall mark

[goldbill]

I am unable to post the image , so I'll do my best to describe what I have.It was aquired in the WWII era, in the NM/M border area.
It is a black Onyx and Silver? necklace , quite ornate, major Onyz pendant has Aztec like face carved on it, with fancy silver all around- 5 beads on top, 3 bigger ones, 2 smaller ones.Long ears or errrings, 6 silver beads below. 3 stones on each side of the rest of the necklace, each with 3 silver beads on outside edge.
Hall mark info on back is- Hecho .. ..xico( letters worn off)letters D I-, the D is very clear, unsure of the second letter, might have been an E, F,H, the crossbar seems too low to be a T.It actually looks like a T turned to the left side 90 deg. In the center is a symbol that appears to be an upright with a center bar or line with others coming all the way across left and right .
Any hep would be appreciated., goldbill.

[dognose]

Hi Goldbill,

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