Looks almost like a mirror image of the Non-pareil on my car.
That's the optional horn for the passenger to sound off with!
Thanks Dan. As ever your perceptive comments are appreciated!
Just thought that likely Rubes mfg. horns or horns by Rubes style were used by other mfg. than Ford. So there were perhaps left and right mount versions. Tried looking in my older magazines for adv. of these, but not much. Did find adv for Nonpareil.
Seems Mr. Rubes was gone by 1910, maybe both horns made by Nonpareil?
Also found this on the web, who knew that brass horn by Rubes was used for amplifying too?
Good point, doesn't have to fit a Ford. I have a couple of photos of RHD 1910s, I'll see if the horn is visible.
I don't think it is for a RHD since the feed tube would angle UPward if mounted on the RH side. Often you see horns opening downward when mounted on the LHD and the feed tube looks like it was last mounted that way. The downward opening of the front bel makes more sense since that way the horn does not fill with water when it rains. Lots of cars including T's have them mounted this way. Not sure if it was a branch assembled thing or owners option to move it.