Sounds like a standard "B" Style Autoharp. The "B"s came in about 64-66 I think. Rounded corners rather thn pointed like the "A" models.

The label would have been silkscreened on the face of the harp. If it says Appalachian in the label its anice harp. The top would be solid spruce rather than a laminated or plywood top.

The bars rarely need replacement if they are aluminum. Just refelt the bars. Harpgirl can connect you with a parts supplier thru the AutoHarp Quarterly. Perhaps Elderly has Harp parts or try Musickits.com.

Look under the chrome plated pin cover at the bottom of the harp for a serial number, there maybe a model number there too, Its been a while since I worked on Autoharps.

Good Luck,

Don