Hi Josephine! AR is the the italian province Arezzo where the goldsmith was registered. After 1934, each gold or silversmith was assigned a number in Italy. After 1968 a five pointed star was added to the left.
There is no Italian province abbreviation MA. Napoli is NA, so just double check the gold marks with a jewelers loupe - MA could be the initials of the goldsmith.
best regards Yvonne Hammouda-Eyre If you would like to join the Antique Jewelry Investor community and stay up to date with all the latest Antique jewelry news, click here....