Excerpt form VAM world. "1899-O VAM-6 Micro O. The 1899-O Micro O coins used the smaller Barber quarter mint mark. The interesting thing about this variety is that the reverse was used as the master to create the 1896-O, 1900-O, and 1902-O micro O coins. The 1899-O Micro Os have six different VAMs: VAM-4, VAM-5, VAM-6, VAM-31 and VAM-32."
















