Silver cross pendant dug today help with makers mark

[richeysd76]

Dug this today pretty sure it's silver. On the clasp I think I can make out (ico) on one side and the other all I can make out is either 25 or 75. Tried to get some pics hard to get good pics on a cell camera. Curious if it's more modern or a little older or if it is even silver

 

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[ARC]

Mexico 925.