Not only are these iron buttons hand-crafted from by a Lexington artist, these iron buttons are also filled with Lexington history.  They are from iron rods that were in one of the barns at Hamburg Place.  While Hamburg Place is currently known for shopping, it was previously a well-know breeding farm for horses.  It was bought by John Madden in 1897.  Prior to this, he had tamed an unruly colt named Hamburg.  [Here is a little background on Hamburg:  His sire was Hanover, winner of Belmont Stakes and thirty-one other races and his paternal grandsire was Hindoo, a winner of the Kentucky Derby, the Travers Stakes and thirty of his thirty-five starts.  Hamburg’s dam was Lady Reel, half-sister to Domino and whose sire was Fellowcraft, a full brother to Spendthrift.]  Hamburg was purchased as a yearling by John E. Madden and proved to be one of the most difficult horses Madden ever broke.  Hamburg raced sixteen-times as a two yr old and won twelve of those starts.  Madden sold Hamburg after his first season, used this money to purchase land, and named it in honor of the horse that helped him buy it.  Madden went on to breed five Kentucky Derby and Belmont Stakes winners and was later inducted into the National Racing Hall of Fame and the Harness Racing Hall of Fame.  Hamburg Place continued to be a well-known horse farm until 1996 when it was sold to be developed.

References:
Thoroughbred Heritage Portraits 
Wikipedia John E Madden
Hamburg Place