You will have to call TC to find out.
No published sn data
Thompson Center does not publish date ranges for there guns, but from the number I would estimate the date to be mid 90's
Frame
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
Contact Thompson Center Customer Service at 1-866-730-1614
You will need to contact Thompson Center Customer Service thru their website.
The Thompson Center Contender with serial number 1 80044 is a Generation 1 (G1) model. The G2 models began with serial numbers higher than 195,000.
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.
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
50-300 usd
No way to tell from just the serial number.