I've got a few engraved K22s. I like them. Yours has what we call deep relief engraving. The factory work is much lighter. There was an engraver in Indiana named Ben Shostle who specialized in it for years and years. I believe he's passed away, but his work lives on. I've had a few of his other guns in the past, and each was a work of art.
We don't have a resident expert on engraving here. I wish we did.
There is an engravers guild, kind of a club or association for those currently in the business. Some of those people can give you clues as to who the craftsman was. Of course you've got your hint on the grip frame, so you need to contact them.
About 5 or 6 years ago my gunshow partner gave me a courtesy call from down state. He'd made is stop at "our" gunshop while passing through to visit his daughter. The courtesy call was to tell me I had a gun on layaway, and I needed to take off work, stop at the bank, and withdraw a bunch of money to bail it out. Friends are nice to have. He not only spent all his money, he worked at spending mine, too.
But he was a pretty smart guy, knew what I needed, so he helped me out.

When I was so impolite as to ask what I'd just bought, he said it was one of those lemons, the ones no one wanted. Thanks, John.
But when I got there on Saturday, he was right about me needing it. The ugly duckling was a postwar 38/44 Heavy Duty. Engraved nearly to death, then they hammered silver wire into every available flat place. The problem was tarnish over the years had discolored the inlay until it was the same color black as the gun. Still, I've had years of experience polishing the family silverware, so when I got it home, I got out the silver polish. Wow did it stand out.
So I took it to a gun show and located my friendly local engraver, Jeff Flannery. Engravers have a funny way of looking at guns. I've seen David Carroll, one of our members here, do the same thing. They kind of hold it by the barrel and bottom corner of the grip frame. Then they gently rotate it, looking at every square inch of the gun, multiple times.
In my situation, he was looking for an engravers mark. A little hidden secret is almost all engravers put their mark on guns. Even factory guns where they're not supposed to, they still often do it, concealed, but there. Jeff's an honest guy, and he'll tell you the truth even if it hurts. But after telling me he had no idea, he smiled and said "here's a guy coming up the aisle who can tell us." He introduced me to the current President of the Engravers Guild." He then took his good natured time examining the gun in detail. In the end, he didn't know either. But he
eased my pain by telling me "If he's not a member of the guild, he sure as hell should be."
So my advice to the OP here is to really examine the gun. under the barrel, around the sideplate and around the frame. I'm going to guess you've got all the information you're going to get from the grip frame.
And now a hint on gun care: Its a work of art, but it does require a little more and different care than a plain gun. Each of the tool cuts adds a lot of surface area to the gun. You need good oil worked down into those places. The best tool for that work is a camel hair brush. No, they don't skin camels to obtain the hair, its squirrel hair.

But a decent quality brush, available at any art supply store will last forever. Use good oil. For my engraved guns I prefer CLP Collectors. Its the same quality product, its just thicker and kind of dries to a waxy compound. If you slather it on and spread it with the brush, making sure you get each cut (a lot of them, I know), you'll protect the gun for a long time.
On the .224 Harvey Kachuck, its just a wildcat center fire that was popular back in the '50s and '60s. It was made obsolete by the introduction of the M53 .22 Jet. It had about the same performance, but the Jet was available over the counter.