One heck of a deal there!
Serial number definitely indicates early.
Is there a 'K' preceding the serial number?
Also a 'K' in the barrel channel of the stock?
Does it have one or two screws in the front of the brass nose cap?
Long base rear sight?
Recessed barrel wedge escutcheons?
PICTURES?
I'm guessing that the barrel has all of the other "Thompson/Center" markings too?
It's like the old song says, "Little Things Mean A Lot".
Cheers,
Smoketown