The fellow with the dubious honor of earning America's first speeding ticket from a motorcycle cop was Charles R. Jones, a resident of Cold Spring Harbor, New York. He was traveling at the breakneck speed of 39 mph!
Seaman was riding an Indian twin, from either 1907 or 1908. The site also includes a
gallery
of police Indian motorcycles from the 1929 and 1951. And here's a bit more about the Indian twin, which was considered the most advanced motorcyle of its time:
Hitting the road in 1901, Indian was not only the first American motorcycle, it was the world's best-selling bike and, having introduced the first V-twin motorcycle to the world in 1907, the most technologically advanced. Harley-Davidson 1910 models, by contrast, were all singles, producing five horsepower or less.
The type of motorcycle Jones was riding when ticketed isn't known, but he was shown riding a Harley-Davidson in 1914.
In 2002, author Buck Lovell released "
American Police Motorcycles
," which offers a historical account of police motorcycle units.