You will need to contact Thompson Center Customer Service thru their website.
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 sn data I know of.
You will need to call TC
Top of the frame. right behind the hammer.
You will have to call TC to find out.
No way to tell from just the serial number.
Thompson Center does not publish date ranges for there guns, but from the number I would estimate the date to be mid 90's