are these older wines drinkable?

[lizajane]

I am involved in a community fundraiser and love wines. Some friends have offered to donate two wines from California
a 1985 Mondavi Cabernet Savignon
and a 1993 Vichon Syrah

are these drinkable? and if I enter them in a silent auction with a minimum bid of $20 for the Mondavi and $15 for the Vichon, is this too much, too little or about right?
the fundraiser is for a very good cause and we would like to give the buyer a good deal and help the cause at the same time.