Johnnie Walker Etched Mirror set

This is a fantastic 4-piece etched mirror set showing part of the New York City skyline. It includes the Twin Towers, The Empire State Building, The Chrysler Building, gold leaf etched Brooklyn Bridge, and a portion of the Hudson Bay among others. It is said that the mirror set was commissioned by the Coca-Cola company in Atlanta as a gift to the three top Superviors at that time, all of which were coming up for retirement. It is also claimed that it is one of only three acid-etched mirror sets, produced by Johnnie Walker, but I don't know where to look for information to verify the statements. It was left hanging in the Supervisor's office at the downtown Coca-Cola building in Griffin, GA on Taylor Street until the new building owner had the building remodeled/renovated for business purposes at which time, he gave the mirror set to one of his employees. The employee is my cousin and he sold it to me. I have had it now for about two years or more and now I would like to know what it's worth.