the 1801 is actually 1901. the "H&A Forehand Model 1901" were manufactured between 1901 and 1909. when H&A introduced thier new "Safety Police" model in 1910 all their other top break revolver were dropped.
yes this model is a black powder only revolver.
Iver Johnson's Arms & Cycle Works 1871-1993
H&R Arms Company 1871-1986 (due spring 2010)
available from www.gunshowbooks.com