Dark Blues.
Hartford played in the NL in 1876 and 1877.
The National League was formed in in 1876 with the following teams: Chicago, St. Louis, Hartford, Boston, Louisville, New York, Philadelphia and Cincinnati.
The Hartford Whalers
National
No, Both American and National league baseball games are 9 innings long
Early Baseball and the Rise of the National League by Tom Melville : McFarland & Company "An original assessment of the forces that developed early baseball into an organized national sport."
The first year of play for the National League was 1876.
South Korea mostly win the national baseball league championship
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The American League and the National League
There was only one "major league", the National League, in 1876 and the teams were Chicago Cubs, St. Louis Cardinals, Hartford, Boston Red Sox, Louisville, New York, Philadelphia Athletics and the Cincinnati Reds.
There are 16 teams in the American League 14 in the National League
The baseball could have been signed for a fan that only had a National League baseball on hand. The baseball could have also been signed during a World Series at a National League park where National League baseballs are the only baseballs available.