I'm surprised that it went for such a low price!
It's also interesting, however, that the revolver (being a cap and ball) was still being carried as late as 1890, when "common knowledge" would have everyone packing cartridge guns by then. Of course we know that caplocks are just as effective as a cartridge revolver (for the first six shots, at least) when loaded properly, and a lot cheaper to shoot (especially if you already own one!), but it's nice to see something solid to back it up in the historical record other than "He had an old-fashioned gun on him."
Cheers,
Gordon