Hi FrancyThere are currently 69 different Autoharp listings on EBay. I looked at one that listed a 21 bar harp for acurrent bid of $152.00. Seems high to me for a Schmidt and I don't care for the 21 bar harps but they are out there. You should be able to find a good replacement for yourself.
Lets see. New strings are more than $100.00 at Juststrings.com, refelting the bars will cost that much anyway, springs are probably .15 a piece. Does that help decide whether to buy new or fix up?
Good luck.
Don