I just bought this really nice set of 1874 100th anniversary of independence medals. Two gilt Bronze, two White metal. I have found a few sales records, the white metal piece in its case seems especially sort after, but have not found a cased set of 4 such as this anywhere.
Does anyone have any infomation on these? or specifically anything on the issue of all 4 together? I don't yet have them in hand so all I have is the photo below, the look to be about UNC and the auction house has described the box as in very good condition.

Any info or opinions welcome! Will having the 4 of them together add additional value perhaps?