50-300 USD or so
The value of a Thompson 50 cal muzzel loader K7846 is about $400.
50- 250 usd
Value will depend on the exact model, Interest in the traditional style muzzle loaders seems to have dropped in favor of the in-line 209 primed rifles. Figure about $250-300. I have a TC Renegade in .50 cal- great shooting rifles.
If you mean the Thompson Center muzzle loading rifle, contact TC customer service through their webiste at tcarms.
100-400 usd
what is the value of a Thompson grey hawk 50 cal. from the custom shop with walnut stock
About tree fiddy
New? $300.
While these are very well made firearms, the value of the traditional sidelock rifles has decreased as in-line muzzle loaders have become more popular. These can be found in very good condition for about $250. I shoot a T-C Hawken in 50 cal, and it is an excellent rifle.
Unfortunately, T/C had a large fire that destoyed most of their production records, and that information is simply not available. I have one in .50 cal, and it is a great rifle.
To find out the age and value of a 50 cal Thompson Center Thunderhawk one will need to call the maker or take the gun to a dealer. You can even call a dealer and give them the serial number 20752 and they may be able to look it up.