I'll relay the story of both of them as best I can, based on my admittedly limited reasearch on the subject.
Bud Brown was the gunsmith/owner of Cherry Corners Gun Shop. He designed and produced the Cherry Corners components which had a great reputation among builders, and eventually tooled up enough to offer his components in a full rifle kit. Sometime around 1976, for reasons perhaps known, but unknown to me, he decided to cease production at Cherry Corners and offer the business for sale. The buyer was Ithaca, and Brown stayed on for a while as a consultant to get them up and running. Ithaca made the rifle, presumably unchanged, for 18 months before (again, for reasons I haven't found) selling their Hawken business to Navy Arms. Navy Arms continued production of the same rifle, adding only their name, using a lot of left over Cherry Corners and Ithaca parts. At some point they began sourcing parts from Italy and offering rebranded Italian Hawkens, although I'm not sure how long they built their own rifles with Italian parts before just offering the rebranded Italian guns. I've read from a few sources that there was some overlap (for example, Ithaca/Hawken barrel with Italian lock), but I haven't studied enough examples to know for myself. The Ithaca/Hawken was the premium rifle from the start, with fine fit and finish. A complete Ithaca/Hawken had a list price in 1977 of $420. If you plug that into an inflation calculator, that equals $2,057.09 today.
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The Hawken Hunter and Hawken Hurricane were original designs of Navy Arms, and were supposedly the pet projects of Val Forgett. These were serious hunters' rifles, with less attention to historical accuracy and embellishment than the Ithaca/Hawken. They were made to have classic looks but to shoot more powerful loads for the toughest big game. The twist rate was sped up to perform with heavy conical bullets. A patent breech with heavy breech plug and attached tang was used to handle the increased pressures. This design was offered under two model names (Hawken Hunter and Hawken Hurricane) in three variations. the Hawken Hunter was a real monster, a .58 caliber rifle with an advertised maximum load of 175 grains of FFFg under a 610 grain slug (yep, you read that right). Val Forgett took this rifle and the Navy Arms Buffalo Hunter to Africa to hunt the "Big Three".
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Also offered was the "Hawken Hurricane", which was basically the same rifle downsized to mortal proportions. It was offered in .50 (advertised max load 140gr FFFg under a 377 grain slug) and .45 (advertised max load 125gr of FFFg under a 255 grain slug). All three models (Hunter, Hurricane .50, and Hurricane .45) listed in their 1976 advertisement for $195, which is $1,017.18 in today's money, a little less than half the price of their Ithaca/Hawken.
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That said, they're both fine rifles for their intended purpose, but their target markets were different. One has to take note, though, of the disparity between their original retail prices adjusted for inflation and what they bring on the used market today in great condition. Personally, I believe today is the "good old days" for buying US made traditional muzzleloaders. There are currently no mass produced US made options, and I doubt there will be in the near future. I think a lot of these guns and Thompson Centers are surfacing as the people who bought them in the '70s-'90s exit the hobby, and I think that will help hold the price down in the near term. But anyone would realize that there's no way we could replicate these guns today for the kind of money they're going for right now on the secondhand market. My advice is if you've got them, keep them, and if you see them at a decent price, buy them. I think we're at the bottom of the price curve. Just my 2 cents.