The Baltimore Orioles logo back in 1901 and 1902 were the typical turn of the century baseball logos, letters of either the city or the nickname. The first Orioles logo is the nickname letter "O" and the final logo was the city letter "B."
Baltimore Orioles
1902
1902
The final logo was a change in letters from “O” to a blue block letter “B.” The letter “B” stands for the city of Baltimore.
Baltimore Orioles
1901
1901
The Orioles original logo is a orange block letter “O” with a black inside color. The letter “O” stands for the team nickname Orioles.