Sorry to be off topic again.
The bass in the Bach videos is labeled, "Lorenzo Carcassi Fec. Dalla Madonna de Ricci in Firence, Anno 1765", but is thought to be made towards the end of the eighteenth century. Keep in mind Carcassi died in 1775. If you want to learn more about the instrument I found a great article.
http://www.krattenmacher.com/publica..._carcassi.html