unused Block Larger Than four NOVAYA LADOGA: 1869 5k. green showing error "25" (type 4) in lower right corner being the lower right corner stamp in a block of four (ex Baughman) and 5k. green block of five showing Types 1-3, 5-6, one with small hole, (ex Lavroff). S1,4 (R;20 known) Photo for error