I would offer less money. Can he supply sewn samples to you to verify that it does indeed sew. These machines used to bring big money aka $5,000.00-7,500.00. Not so much any more. New the 767H which replaced the 221 is expensive. $, 15,000.00 plus. I would offer $3,000.00 tops. It is indeed a real Adler. Just so you know, the 3 pedal system on the bottom of the stand that works the motor, reverse, foot lift is cast , not stamped. The pedal system last time i check which was years ago was $950.00!! just for that.
glenn