Dear Daniel
As a charter member, past president and current secretary of the HHS, please accept my apologies for any lack of responsiveness on our part. I was not made aware of your inquiries.
You may want to avail yourself of Laure Barthel’s book ‘Au Coeur de la Harpe au XVIIIeme Siecle’.
Here are some links to articles on Beat Wolf’s website:
http://www.beatwolf.ch/hochbrucker.htm
http://www.single-action-harp.ch/downloads/Restoration%20Louvet%20harp.pdf
http://www.single-action-harp.ch/downloads/The%20Louis%20XVI-harp.pdf
There are also pictures of an early Louvet at
http://www.thurau-harps.com/
Click on ‘Harps’, then scroll down and click on ‘Antique and Used Modern Pedal Harps’, then scroll down to find the Louvet.
The earliest extant pedal harp would probably be either the Hochbrucker described in Wolf’s article, or the one in the Kunsthistorishes Museum.
I’m not certain about the earliest French harp of any kind that can be specifically dated, but I do know that Mike Parker built a copy of a French triple harp that was dated 1710.
I hope this information is useful. Please do let me know if you have any more questions.
Thanks,
Paul