I don't see a picture of the glasses - if they have a "seal" or logo of the Indianapolis 500 on the front, and are black letters with a gold rim, they are the official glasses from the Speedway. These were given out (not sold) from the track management. Late 1951 after the race. 1951 is a pretty early date, so the value would be around $8 to $10 approx. They are not scarce or rare, but popular especially around May (race month in Indianapolis) or at Christmas when people like to give gifts. Usually given out as a "set" of 4 or 6 of the same glass. If you have a box that adds to the value.