Can you provide the date of this motorcycle?
 

I am going through some family photos and I have come across a picture I can't identify that maybe you would like to help with. Here is a photo of my father's Uncle on the back of an early Harley Davidson - year???
https://cimg4.ibsrv.net/gimg/www.hdf...a8ad0a3488.jpg

1912, X8E Would be my guess

I'd say that's a pretty fair guess if not spot on.
https://nationalmcmuseum.org/2018/08...on-v-twin-x8e/

https://cimg5.ibsrv.net/gimg/www.hdf...bad00f4138.jpg

https://cimg0.ibsrv.net/gimg/www.hdf...c93e8509b.jpeg
https://cimg1.ibsrv.net/gimg/www.hdf...019d8f8ac.jpeg
https://cimg2.ibsrv.net/gimg/www.hdf...a77cb6c3e.jpeg

To me it appears to be a 1914 Model 10-E, footboards were first available for the 1914 model year. Also, it's not a two-speed model 10-F as I don't see the small lever to operate the two-speed rear hub.

(edit) .. I should have first welcomed BfloJim to the Forums with his first post and thanked him for posting the early H-D family photo. I have a family photo of my Great Grandfather also seated on a 1914 H-D Model 10-E twin taken in Milwaukee WI where my family roots are. His cycle was additionally fitted with a speedometer and an acetylene headlamp.

BfloJim, did your family photo originate in New York, or was it taken in another city/state?

Good catch,I think we have a winner here.
https://www.mecum.com/lots/362345/

https://cimg3.ibsrv.net/gimg/www.hdf...1b09eb65d7.jpg