what would twenty thousand leagues under the sea.antique in perfect cond.print in 1876 go for?.?

Answer 1

That would depend on which publisher, how scarce, etc..

I've included a link to give you an idea of how many different versions of the same book are out there, many of them from the time period yours was printed. Also, to give you a ballpark figure of what it might be worth, a link to abebooks which handles that sort of thing, but nothing exactly like you've described.

For a valuation you need to contact a reputable antiquarian book dealer.

Answer 2

keep us posted please.