This is a nylon string antique harp guitar. It has 6 fretted strings and 6 suspended'harp' strings which can be tuned to any bass notes you wish. Bowl backed and with a lovely rosette and a curved headstock that supports all 12 strings.
I bought this around 12 years ago from a dealer in Germany and was advised at the time that it was around 100 years old. This makes sense as there was a harp guitar boom around 1910-20 but dating tis instrument is tough due to no obvious details or inscriptions.
As an example of tuning, I have used this instrument in EBGDAD, C#BAGF#D high to low. I haven't used this instrument in some time so may need some attention to get it fully set up but otherwise it looks wonderful and a great display piece. Any other questions then please message and I'd be happy to help. This item is in the category "Antiques\Musical Instruments\String". The seller is "robcaste_123" and is located in this country: GB. This item can be shipped to United Kingdom.