Serbia group. Multiples of the 19th century, the Belgrade print Prince Michael 1p green mint block of 20 and the 2p brown in mint block of 6 (#7/8), plus the 1869/78 Prince Milan 1p yellow (#16) in mint block of 8. All never hinged with fresh colors and gum. Scott $440 as hinged singles  Estimate $150 - 200. $0