George...
is self-authenticating AFAIK. Also, the seller and the buyer = two witnesses. Two more witnesses not party to the transaction would make for four witnesses. To firm up the witness role one can have the seller sign again at the bottom adding a clause somewhere in the body like the following:"I, ................................ (name of seller), do hereby"
Keep in mind seals allow for deeds (one-sided contracts). The second time the seller signs the seller would be as a witness. A notary would be a third witness but the notary would also be entering the ID # in the notarial register."In witness whereof we have set our hands or seals hereto".
Signature of the Buyer:
Signature of the Seller: