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Sure. I like pictures of Hawken rifles.
50-350
$100.00 at best depending on condition!
I have a Ranson in ,45 calibre, the nipple on my rifle is M6x.75. Some Italian rifles have M6x100 threads.
100-300 USD
Go to the website of the MAKER of your rifle (Hawken is a style, not a brand). You should find an owner's manual you can download, or request a paper copy for free.
Read books, look at real ones in museums, gun shows, gun shops and ask Hawken collectors.
You need a professional appraisal. Fakes abound and are vey hard to spot if you are not familiar with the item in question.
If its a real Hawken, and most are not, then its almost priceless. The vast majority of the real authentic Hawkens are in museums or private owners who can trace their history back 150+ years.
The name of the rifle is Hawken, after the original makers, Samuel & Jacob Hawken of St. Louis MO. The name became used by other companies making a rifle that was large bore (.50 or larger) with a half stock, and set triggers. Many companies make, or have made, a Hawken style rifle. However, the "in line" muzzle loader rifles have reduced interest in traditional side lock rifles. You may want to check on line gun auctions, such as auctionarms.com, or gunbroker.com for examples. MY Hawken is a Thompson/Center "Renegade" .50 cal- and it is a great shooting rifle.
Contact E-Bay
I PAID $300 FOR MINE LAST YEAR ,AN OLDER RIFLE BUT VERY CLEAN. 50 CAL MUZZLE OADER, PERCUSSION CAP.