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I have inherited two brooches, and are trying to identify the hallmarks on the back, the first one, is two gold leafs with the marks OMA 750 and what looks to be 52 AR (in this order)it is possible that there is a letter r or c before the OMA, but it is hard to tell if its a letter or a smudge
I know that the AR means Arezzo, but can not identify the oma or the 52
the other brooch is a decorative leaf, flower and pink stones, with what appears to be 98? the 8 could be a 5, the last letter/number is smudge, then 750, then the letters MA, MANY THANKS