aviators99
Model S - R140
Yes, signature vehicles have an S in the 12th character of the VIN (last character before the serial number). Your vehicle is clearly not a Signature vechicle. Someone knowledgeable about Tesla VINs can tell that right from their page.
VIN decoding info here:
ftp://ftp.nhtsa.dot.gov/MfrMail/ORG9130.pdf
They also say "Signature" on the back of the car.