Say, is that the world's first superbike, a four cylinder, shaft drive FN?
And look, a liquid cooled, two stroke Scott!
Douglas - the first bike ridden around the world. 'Twas Douglas what taught BMW about opposed twins (true!)
Once upon a time Indian was run by motorcycle enthusiasts. Note the rear suspensions, years and even decades ahead of nearly all other marques.
And that speedy Harley looks to be the famous "Silent Gray Fellow", the model whose well balanced goodness put H-D on the map.
And all before the Great War. Outstanding! Thank you for the post and a great big thanks to the men and women who keep these grand machines on the road.