I acquired this wonderful jewelry recently - sweater clips, very popular with women in the 50's. I cannot find the ID of the mark on the back - I have tried my best with the photo - but the mark is directly under the clip. I think there are two letters followed by 925, and underneath that in a circle what looks like MARGARITA=. Does anyone recognize this mark? Judging from the quality of the silver, I am certain it is Mexican silver. The photo shows a close-up of one of the clip buttons, the full clip with chain in the middle and the mark on the back. Thank you everyone.