Help in identifying the makers mark and place of origin

[mbcda75]

These earrings belonged to my grandmother and were handed down to me. I am trying to find out the maker and place of origin if any one could please help.

 

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[on.off]

from the front it looks sort of native american, but the mark on the back looks like an eastern european--polish or estonian--figure. it is same female profile seen on polish hallmarks, although it is obviously much larger than ordinary hallmarks. ES=estonia? the 3 may stand for 3rd standard of silver, which in poland was .800. is there anything in your grandmother's history that might suggest she had earrings from eastern europe? they look a little atypical of eastern european jewelry to me, though, so whoever made them may have simply repurposed a piece of flat silver from another item. they look 40s or 50s.