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Bummy Davis had a unique emblem on his boxing shorts. On the left side of the trunks was a star of david.
New York City boxer called "Bummy Davis" made a name for himself as a welterweight boxer in NYC. His real name was Avrohom Davidoff.
The possessive form of the proper noun Al Davis is Al Davis' or Al Davis's. Both are accepted possessive forms for singular nouns that end with s.
Example:
We went to Al Davis' reception.
We Went to Al Davis's reception.
Ron Ross has written:
'Growing Beyond Life's Hurts'
'Echoes of Wisdom'
'Bummy Davis vs. Murder, Inc'
Al Davis' book.