I would need to know the serial# and two letter date code stamped on the barrel to be exact, but these have been imported since 1979 under several store brands as well as the investarms name and are still sold today by Lyman and Cabela's.
You will need a professional appraisal
You can obtain a manual for the Charles Daly .50 caliber Hawken made by Investarms by visiting the official Investarms website, where they may offer downloadable manuals or contact information for customer support. Additionally, you can check online retailers or forums dedicated to firearms, as they often have resources and community members who can help. Lastly, consider reaching out to Charles Daly directly for assistance in acquiring the manual.
Yes
Stevens.
Remington
Unknown.
Take the rifle to a gun shop so they can figure out what make, model and caliber rifle you have. There is no 84 caliber long rifle.
Springfield Armory
H&a
The .950 JD Jones is the largest sporting rifle caliber made.
They were made in several calibers- will be marked on the barrel.
WHICH rifle? There is more than one type made in this caliber.