Big medallion

[mojjax]

I bought this at a yard sale for 2 bucks last summer . I was wondering if anyone knows anything about it ? how much is it worth ? It is 3'' across , 3/8'' thick ,and it weighs 7 ounces . the signature under the shoulder says B . L . Pratt . Thanks !
mojjax

 

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[PBK]

It's a medal commemorating the centennial of the Roman Catholic Archdiocese of Boston in 1908.

The portrait is that of Archbishop (later Cardinal) William O'Connell, who served in Boston from 1907 until 1944. The Latin inscription translates as, "William, Archbishop of Boston, 1908."

The inscription above the arms on the reverse means something like, "Completing 100 Happy Years of the Archdiocese"; the motto Vigor in Arduis, "Vigor in the Midst of Challenges."

This medal may have been struck in other metals as well. There's also a smaller silver medal of the same design:

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