Looks like just under 43k miles. Anybody know why in the description it would say: "Must be sold to an out of state resident or licensed dealer"? https://www.mecum.com/lots/CA0819-380603/1987-buick-gnx/
I asked myself the same question. My guess is that otherwise there is an adverse state tax consequence for the seller.
I did a little research. Otherwise, the seller or maybe the auction house must collect the sales tax from the purchaser and pay the appropriate taxing California entities.