American Eagle Biplane Bill of Sale - 1929

Two copies of an original Bill of Sale for a 1928 American Eagle Biplane with an OX5 engine.  Document details a time payment plan for a total price of $1300 !  Listed are the aircraft, engine and propeller serial numbers.  The first document is on onion skin but signed in ink by the sellers and a notary.  The second copy is identical to the first except boldly inscribed across the face "Paid in Full" and also signed below (again) by the sellers.  Documents are both very legible but tattered across the right margin.