If truly at least 90 percent, somewhere around 300 USD.
Check the on line gun auction sites, gunstores, newpapers, Shotgun News, Gun List, etc..
==Value of a Browning .22== Much of the value of your .22 Browning depends on its condition, the grade (I, II, or III), and its place of manufacture. In 1968, I believe most were still being made in Belgium. Try one of the arms auction sites on line (such as: Gunbroker.com) and check with the experts on their forums. Or, you can always go to a gun dealer and have it appraised. Good luck.
You can get a historical letter from Browning that will date it if they have the records. Check internet gun auction sites for prices of ones similar to yours.
Check the auction sites. Very broad price range would be 500-800.
A Browning Sweet Sixteen shotgun that was made in Belgium can be found for sale at GunBroker.com,or auctionarms.com,both of these sites generally have them listed for sale.You may also browse the local gun shops in your area.
They don't come up for sale often. You will need to go to the auction sites to see what they are bringing.
Try these sites: Numrich gunpartscorp.com Jack First jackfirstgun.com Bob's Gun Shop gun-parts.com
Try on line gun stock sites, gun shows, gun shops, egunparts and Shotgun News.
Mobile Sites are not fixed to locations.
Check the auction sites. To many variables that you don't address, like overall condition, accessories, box, manual, number of rounds fired, etc..
Go to Midwest Gun Works or Browning web sites. Both have manuals you can download.
You really need to check the acution sites. Large amounts of money are detracted for it not being EXACTLY the way it was when it left the factory. This includes all packaging, papers, etc..