The Newark Adriatics, also known as the Adriatic Base Ball Club of Newark, was a member of the National Association of Base Ball Players before the American Civil War.
The Adriatics first played another member in September 1857 and joined the NABBP for the 1858 to 1861 seasons.
These are all the Newark Adriatics games listed somewhere by Marshall Wright (2000).
Only that spring, sixteen clubs within modern New York had convened for the first time, which was later recognized as initiating the Association.
Wright, Marshall D. The National Association of Base Ball Players, 1857-1870.