I had a post about my electric autoharp a while back. Here is an acoustic autoharp that I own. I am not sure how old this one is, but it is similar to some that I have seen dated back to the late 1800's.
The unique thing about this particular autoharp, named "the Silver Queen", is that it has a drawer that slides back and forth to transpose the chords into any key and since the strings are tuned to the chromatic scale, so you can literally play any chord in any key that you wish .
Please do not email me about prices for this or any other items on my blog - for I am just sharing information and not interested in selling any of these instruments.