Auction # 2446 ARGENTINA: Special December auction

VERY RARE BLOCK OF 4: GJ.353b + 353a, 1912 12c. Plowman, block of 4 originally overprinted "M.I." to which a second "I." was added by typography, the top pair with "M.I.I:" and "M.I." overprints, very few known, probably the only block in existence, very fine quality, signed by Victor Kneitschel on back!