This is... not flashy at all, but a good utility card for "Big Hand" Harvey.
It's no match for Duke, but what is?
It's about equal to Roland's .38 Special, since it just lets you do what you wanted to do a bit better.
It's a bit better than Heirloom of Hyperborea, since it always lets Harvey do what he's good at as opposed to being good only in some builds.
It's better than Jake Williams, since you will always want to play it, and better than Jenny's Twin .45s, because it doesn't fill your hand slots. It's better than Becky, because Harvey doesn't have an overly-close attachment to his Vault that makes other investigators nervous.