Rhuff has it right, AND that number on the frame just in front and above the trigger guard is the one that the BATF expects to be there, as the frame is what they consider to be the "gun" part.
There may be additional numbers on the left side of the chamber or bottom of the barrel.
Examine closely for file or grind marks, and if you see them suggesting that numbers have been altered, run! If for no other reason than the value just dropped to the $500 range.
dju
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