The below is from Evan Price's 2012 post. All applies to my Hopkins & Allen as well. Everything he posted is identical to my revolver.
In a subsequent post he added:
thought all the large frame break-tops were chambered for 38 S&W?
The patent date from 1898 is not addressed at the Firearms Forum posting, which I had seen. I thought perhaps with the 1898 patent this might have been a model they started producing before the factory fire in 1901.
Would be interested in knowing more about it including date of manufacture, the serial number is the letter "I" followed by four digits. Since it is rollmarked Hopkins & Allen Arms it must be a post-1899.
It 'looks' to me like a Forehand, which had 6-shot 32 S&W Long, however, the top latch is retained on mine by a screw, and the Forehands I've seen use a pin instead. Also they say "Forehand" on the roll mark on the barrel, and the serial number is on the front of the grip under the trigger guard, whereas mine is on the bottom of the butt.
In this thread is a nice Forehand top break-
http://www.thefirearmsforum.com/showthread.php?t=47307
However you will also note that mine has, at the front of the cylinder just under the center rod, a pin-retained tiny black push-button which, when pushed, allows the cylinder to be removed from the center rod.
Forehands don't have that.
And my hammer and trigger are different, mine are case colored and appear more detailed than the Forehand items
It's 32 S&W Long, 6-shot cylinder, auto ejector. Barrel is 3.25" long. Tight mechanically, timing is on, clean & shiny barrel lands & grooves, nice finish, grips are good.
It's not a Forehand or Model of 1901 because it doesn't say so on the topstrap. It's not a Safety Police because it doesn't say so on the topstrap, and it does not have the Safety Police top latch. It's not a Double Action XL because it's top break. It's not a small frame auto eject because the cylinder is not 5 shot.
All it says on the topstrap is Hopkins & Allen Arms Norwich CT USA and the patent date of Dec 6 98. The grips have the H&A logo. There are three screw heads on the left side- hammer screw, hinge screw and top latch screw.