Hello, Dianne -
Auto harps are still being made under the Oscar Schmidt brand name. The company may hold records in its archives listing the years specific models and serial number ranges were manufactured.
I suggest you contact the manufacturer and ask if there are records in the company archives which can give you and idea of the age of the instrument:
http://www.oscarschmidt.com/info/contact.asp
There is also a discussion forum for those who are interested in auto harps:
Autoharp Talk:
http://autoharpworks.com/phpbb/index.php?sid=e588252ffdb23d2e5dad104a6d31962c
You will need to register (free) to post a question.
Best wishes.
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