This 1887-1888 Humber safety is a somewhat modernised version of the original 1885-model. (pictures of that one will follow later)
I saw this one on a Steam Fair in the UK and the owner told me it's a very original bicycle, apart from the braking system, which he made himself, without having a proper example.
This is the last Humber safety with the smaller front wheel. I have a very faint copy of the English 1887 catalogue that shows this bicycle, and a far better illustration, with this braking system, is in the 1888 French Humber catalogue. I added that illustration to my photostream.
Click picture for more pictures.