Jan,
The best I can offer is from a derived serial number range for M&H double action revolvers in the Vorisek book on Hopkins & Allen firearms.
M&H serial number 9199 would be estimated from early 1884.
I have a fairly decent little .32 M&H but it needs grips (It's currently wearing a purloined pair of S&W panels) and internally needs a single action sear.
(The step has broken off.)
So, if anybody could help me out on these, I would be eternally grateful....
