How much would Bartolomeo Cristofori's pianos cost?

They came out in l720 ad so are purely museum pieces- no one would attempt to use one as a concert instrument- the risks are too great- they have one in the Metropolitant Museum of Art"s musical instrument colllection. They are, as stated priceless museum pieces and not suitable for regular use. please don"t try to pound out a C-Chord for old time"s sakes ( Pun intended) the instrument is probably under glass to prevent such a practice!