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As best I can tell without pictures of the actual gun and the reference books...
A six shot top break Harrington & Richardson is probably a .32 S&W.
If the caliber is not stamped on the barrel, it is a black powder weapon.
I am sure a lot of them have been shot with smokeless, which is not loaded any hotter than it ever was, but I am not telling you that it is OK for you and your gun.
The single patent date spelled out marks it as a second variation, made only from 1890 til 1892.
Magnum Wheel Man can probably give you some pointers on shooting the old gun.
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