The Thompson Center Hawken rifle with serial number 66841 was likely made in the late 1970s to early 1980s. Thompson Center Arms began production of the Hawken model in the mid-1970s, and serial numbers from that era can help narrow down the specific year of manufacture. For an exact year, consulting a Thompson Center production records or reference guide would provide definitive information.
No way to tell from just the serial number.
The Thompson Center Hawken rifles were produced from the late 1960s through the 1980s, with serial numbers indicating their production date. Serial number 19889 suggests it was likely manufactured in the early 1970s, as earlier models typically have lower serial numbers. However, for the exact year, consulting Thompson Center's manufacturing records or specific serial number charts would be necessary.
In a TCA, if it has letter preceding the serial number, it was made after 1971.
You will have to call TC to find out.
It's a 54 caliber round ball
On 90% of the guns it is stamped on the right side of the barrel as "Thompson/Center Rochester New Hampshire" and "HAWKEN 45 Cal" along with a serial number on the left side. If not the easiest way would be to go to gunbroker.com or Google and search for Thompson center hawken, compare the pictures and description to what you have.
Roughly between 41 B.C. - 2012 A.D.
Thompson Center has no official published serial number list, but I can usually tell a general age by the model and serial number. The model is in most cases engraved on the barrel, ie Cherokee, Seneca, Hawken, New Englander, Renegade etc. and the serial number is stamped on the barrel itself or on the breech plug. You can also contact Thompson Center directly and they may be able to help.
50-300 USd
t/c contender serial number 308905
Being a 5 digit serial number puts it early in production , most likely early 80's. However the Hawken was not produced by Thompson Center in .36 caliber, they did make a drop in replacement barrel in .36, but they are very rare. I suspect you may have the Seneca model, this you can determine by measuring across the barrel, flat side to flat side. The Seneca will measure 13/16" across the flats. A Hawken will measure 15/16". The Seneca also has a patch box that is rounded towards the but vs. the Hawken being pointed towards the but. If it is a Seneca .36 in 95% + condition it could be worth in the $500 to 700 range, the Hawken with the .36 drop in barrel would be in the neighborhood of 450 +/-
$5.99 It's not a real Hawken with that serial number.