In full, the note reads:
This is the Badge of the Special Police Officer of St James’s Westminster which I wore on the 10th of April 1848 on the occasion ofNapoleon III was Emperor from 1852 to 1870, so this piece of paper certainly dates from after 1852, and from the wording is most likely post 1870.
The Squad to which I was attached was drilled in St James’s church yard when in another squad at the same time was Prince Louis Napoleon afterwards Napoleon 3rd Emperor of the French
On the back is written a later note which reads
Armlet for special police issued at the time of the Chartist “Riots”And what is frustrating about that? Apart from not knowing who Francis Cavendish might have been (no connection that I can find to the Dukes of Devonshire), the main problem is the lack of the badge.
Still, it is an interesting little document providing a link to the events of that day.
There is more here on Policing the Chartists.
And here on the events of 10 April 1848.
There is also a whole lot more Chartist memorabilia.