Where did the interlocking NY of the Yankees' logo come from?

One of the most beloved logos in sports is the Yankees' interlocking NY. The logo has seen many changes throughout the years, but how the original came about has an interesting backstory. In 1877, Tiffany created a medal for the New York Police Department to give to policeman John McDowell. This was a valor medal because McDowell had been shot and survived. The logo was adopted onto the uniform in 1909. This may have to do with the fact that one of the Yankees' owners at the time, Bill Devery, was a former policeman. Even though the logo looks similar, the design went through some changes.

 
 

The bridge of the "N" on the medal has a more wavy line than the uniform logo. Also, on the medal, the "N" seems to be going over the "Y" while on the uniform the opposite is true. Overall, even though the Yankees' logo has evolved many times, it is still one of the best in all of sports.