Contact T/C customer service through their website.
You will have to call TC to find out.
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.
t/c contender serial number 308905
The Thompson Contender with a serial number of 7000 was made in the year 1967. Thompson/Center Arms is a firearm company that is based in Rochester, New Hampshire
Contact Thompson Center Customer Service at 1-866-730-1614
No way to tell from just the serial number.
You will need to contact Thompson Center Customer Service thru their website.
50-300 usd
Thompson Center does not publish date ranges for there guns, but from the number I would estimate the date to be mid 90's
In a TCA, if it has letter preceding the serial number, it was made after 1971.
Frame
It's a 54 caliber round ball